San Diego is the nearest point to Tijuana, Mexico. It is in the list of 10 safest cities in the US, and one of the wealthiest cities in the country.

I flew on United Airlines to San Diego(it's been quite a while since my last flight on a United), and realized that the airline does not serve any food for short haul flights anymore. But if you like, you can purchase the food at $10 from Au bon Pain with a choice between a chef's salad and a turkey/cheddar sandwich. Upon arrival, I took a bus going downtown ($2.25) right outside the arrival hall. After checking in at the hostel, I began to explore the city. Downtown San Diego is served by trolleys, and buses. You can purchase tickets at the vending machines located at most stops.

San Diego is full of attractions. As I only have two days here, I decided to visit the San Diego Zoo. San Diego is one of the best zoos in the world (entrance fee is $21). It is a sanctuary for thousands of animals with beautiful landscape of rare plants from all climates and a living classroom that entertains as well as educates. There is a new 7.5-acre multi-species habitat features elephants, California condors, jaguars and more. It also offers guests an insight about the Zoo's conservation efforts to protect wildlife from becoming extinct. Meanwhile, Balboa Park in neighboring San Diego Zoo offers an in-the-city oasis of culture, entertainment and sightseeing. It is an urban cultural park with more than a dozen museums, an outdoor concert - Spreckels Organ Pavillion, and the famous Old Globe Theatre among others. Activities are plenty in the park including fortune-telling, music, and games.

The Old Town San Diego is a frequent visit for many San Diego residents as well as tourists. Within Old Town there are three Park Agencies: State, City and County, all of which have historic sites operated as museums. Old Town San Diego State Historic Park is the most visited park in the state system and all its museums are free to the public. There are many restaurants here offering authentic and cultural cuisine. In addition to food and shopping, Old Town hosts many events and has nightly entertainment in many of the restaurants located here. Walking tour of historic sites is available as well.

By the harbor, there is the USS Midway Museum, a real naval aircraft carrier that served in the United States for more than 40 years. It has real jets and real airplanes up on the flight deck, that you can actually walk into and sit in the cockpits of some planes. Further up the shore is the Maritime Museum of San Diego, which is home to the world's oldest sailing vessel that still sails - The Star of India.

Seaport Village is an interesting shopping area over 90,000 square feet. It is located at downtown San Diego on West Harbor Drive and Pacific Highway. It has cobblestone pathways bordered by ponds, lakes, fountains and lush landscapes. Along the San Diego Bay there is a quarter mile boardwalk. There are lots of restaurants and cafes, and specialty shops selling anything from jewelry to wind chimes and organic food. Westfield at Horton Plaza on Broadway is another good place to shop. It is situated next to the city's historic Gaslamp Quarter, a historical neighborhood in downtown San Diego, and it has some remarkable bright colors exterior, and odd spatial rhythms.

Weather is mild in San Diego. It is one of the best cities to live in the United States. Plus, its proximity to the Pacific Ocean. All these, and the attractions have made the city one of the top destinations in America.

After two days in the city, I took the bright red trolley (cost $2.50) to San Ysidro, the last stop at the border between the US and Mexico. The ride was about 40 minutes (a Greyhound bus to Tijuana cost $7). Once there, I just followed the crowd and the next thing I knew I was in Tijuana!

Situated on the United States-Mexico border adjacent to its sister city of San Diego, Tijuana is the largest city of the Mexican state of Baja California. Over forty-million people cross the border each year between Tijuana and San Ysidro, California, making it the busiest land-border crossing in the world.

A walk to the town center (where the infamous Tijuana Arch is located) is about 20 minutes. You can see the Tijuana arch from almost anywhere in town, and it's the landmark to head back to if you get lost. I thought I would see drunken rowdy Americans, and illegal street activities in broad daylight, but nothing came close.

Tijuana is a pretty quiet town, with lots of places selling cheap tacos (one for $1) and beers (draft beer for 0.99 cents). Souvenir shops are everywhere. The town offers goods from all over Mexico on sale prices. However, like any other places, the best deals are found on the goods made locally. In this case, the best deals in Tijuana are on leather goods. If you need anything in leather from purses to pants or motorcycle jackets to back packs , this is the place.

For many visitors, Avenida Revolución has been a mecca for tourists visiting Tijuana. In the early days it was known as a bawdy center for illicit fun. But now, some of the original attractions are prohibited: Gambling was outlawed in the 1930s, back-alley cockfights are also illegal, and the girlie shows whose barkers once accosted passersby are slowly diminishing. Don't expect staid and sedentary, however. Drinking and shopping are the main order of business these days; while revelers from across the border knock back tequila shooters and dangle precariously from the upstairs railings of glaring bars, bargain hunters peruse the never-ending array of goods (and not-so-goods) for sale.

If you're looking to see a different side of Tijuana, the best place to start is the Centro Cultural Tijuana (Tijuana Cultural Center). You can easily spot the ultramodern complex, designed by irrepressible modern architect Pedro Ramírez Vásquez, by its centerpiece gigantic sand-colored dome. The center also holds the Museo de las Californias (Museum of the Californias), with exhibits that trace the history of the Californias, dating back to prehistoric times. While you are there, stop to admire the wide, European-style Paseo de los Héroes. The boulevard's intersections are gigantic glorietas (traffic circles), at the center of which stand statuesque monuments to leaders ranging from Aztec Emperor Cuauhtémoc to Abraham Lincoln.

Many foreigners travel to Tijuana to drink and dance, buy prescription drugs, illegal drugs (especially in and around dance clubs), purchase bootleg brand-name clothing, timepieces, and other personal accessories found globally, as well as manufactured and hand-crafted local curiosities. While still an entertaining town with an enjoyable atmosphere, locals and tourists alike would agree that it has lost its "anything goes" mentality which it had once acquired, a mindset that was dangerous to tourists, locals, and the tourism industry as a whole.

Next day later, I went to General Abelardo L Rodriguez International Airport for my flight to Mérida in the Yucatan Peninsula (cost $6).

I arrived in Mérida International Airport in the afternoon. It was a hot and humid day in August. I hailed for a taxi to take me to Zocalo Square (Main Square, cost $11). I did not expect much traffic, but I was surprised that Mérida can be quite congested with traffic and pollution.

Mérida is the capital and largest city in the Yucatan Peninsula. It is the twelve most populous city in Mexico. As the state and regional capital, Mérida is a cultural center, featuring multiple museums, art galleries, restaurants, and shops. Mérida retains an abundance of beautiful colonial buildings and is a vibrant cultural center with music and dancing playing an important part in day-to-day life. The town has a casual, relaxed feel despite the traffic and human congestions. Most buildings are in stucco and painted in light colors. I did not see lots of plants in the tropical city, if I did, most of them just grew naturally without any human intervention.

Zocalo Square is full of people sitting on benches, talking, and taking a relaxing stroll. The shades provided by the trees are so inviting, and it makes you want to sit and chat on one of its famous benches 'for two', any time of the day. It is a mixture of present and past, framed in by the San Ildefonso Cathedral, the Montejo House, the State Capital Building and the City Hall, creating a whole architectural feast. Horse-drawn carriages are plenty parking on the side of the cathedral on Calle 61, and they might be a good idea for a ride on a hot day.

The cathedral is the oldest on the continent, built between 1561 and 1598. Much of the stone in the cathedral's walls came from the ruins of Tihó, the former Maya City. Next to the cathedral is the old bishop's palace, which is now converted into an art museum, Museo de Arte Contemporáneo Ateneo de Yucatán. There are 17 exhibition rooms display work by contemporary artists, mostly from Yucatán. Palacio Montejo is a fine example of the Spanish architectural style known as plateresque. A bank occupies the building now, but you can enter the courtyard, and view the garden, and see the charming residence once lived by the Montejos descendants (the Montejo family once conquered Yucatán). Next, you can go to the second floor to see the meeting of all the city council at Palacio Municipal (Town Hall), and enjoy the view of the square from the balcony.

The streets can be quiet as soon as the sun goes down when the people go straight home after work. It can be very charming at night with spot lights beaming the structures around Zocalo Square.

The next day, I had to wake up early (4 am) to catch the first bus at 6 am to Uxmal.

One way fare is peso 32 (US$3). The journey takes about an hour. Entrance to Uxmal is 88 peso ($8). Uxmal is a large pre-Columbian ruined city of the Maya Civilazation in Yucatán. Uxmal, a UNESCO World Heritage Site, holds some of the most complex and beautiful examples of the regional Puuc-style architecture, and its magnificent pyramids and structures make it a popular tourist destination. The Maya architecture here is considered matched only by that of Palenque in elegance and beauty. Thanks to its good state of preservation, it is one of the few Maya cities where the casual visitor can get a good idea of how the entire ceremonial center looked in ancient times. Some of the outstanding buildings here include: The Governor's Palace, Adivino (Pyramid of the Magician),Nunnery Quadrangle (government's palace), and the Ballcourt.

It may be a good idea to come here as early as possible as the sun can be pretty hot by 10 am (I am glad I did). A tour which include lunch is 300 peso plus the entrance fee. For Uxmal, joining the tour is not a bad idea cause one has to walk out, and wait by the roadside for the bus back to Mérida (I waited an hour). This can be confusing as too many buses go by.

Again, I woke up at 4 am the next day as I was planning to visit Chichèn Itzà, a UNESCO Heritage site.

The bus ride cost 49 peso and the journey is about 2 1/2 hours. Entrance is 88 peso. Chichèn Itzà is also another large pre-Columbian archaeological site built by the Mayan Civilization. The site exhibits a multitude of architectural styles, from what is called "In the Mexican Origin" and reminiscent of styles seen in central Mexico to the Puuc style found among the Puuc Maya of the northern lowlands. The site contains many fine stone buildings in various states of preservation, and many have been restored. The buildings are connected by a dense network of formerly paved roads, called sacbeob. The buildings of Chichén Itza are grouped in a series of architectonic sets, and each set was at one time separated from the other by a series of low walls. The three best known of these complexes are the Great North Platform, which includes the monuments of El Castillo, Temple of Warriors and the Great Ball Court; The Ossario Group, which includes the pyramid of the same name as well as the Temple of Xtoloc; and the Central Group, which includes the Caracol, Las Monjas, and Akab Dzib. Dominating the center of Chichén is the Temple of Kukulkan, often referred to as "El Castillo" (the castle). This step pyramid has a ground plan of square terraces with stairways up each of the four sides to the temple on top.

You can walk up El Castillo. Each side has 91 steps, and you can have a very nice 360 degree view of the surrounding. It can be hot once you're up there. Bus stops in front of the site, so it might be a good idea to go on your own instead of joining a tour. There are lots of souvenir shops outside.

That night I had a delicious Sopa de Lima, a lime soup with a chicken broth base accompanied by shredded turkey and crispy tortilla. I left Mérida the next day heading back to Tijuana. It cost $8 to the airport.