
San Diego is the second largest city in California, known for its ideal climate, miles of beaches, and location on the Mexican border, right across from Tijuana. It has a rich heritage built around sailing and is home to the Pacific Fleet of the United States Navy. It is also well known for its part in the wildlife conservation movement, being home to a SeaWorld theme park and the "world-famous" San Diego Zoo and Wild Animal Park.
* San Diego is probably the best city in America for making a quick trip to Mexico. Tijuana, San Diego's twin city across the border, is very easy to reach by public transit. The San Diego Trolley's Blue Line provides service from downtown San Diego to the US-Mexican border. The trip on the trolley takes about 45 minutes from downtown. Once you reach the end of the line (San Ysidro), follow the people and signs to the border crossing. It takes less than five minutes from the trolley stop to cross the border, followed by either a 20-minute walk or a five-minute taxi ride to reach Av. Revolucion, the main tourist shopping area in Tijuana. If you take a car, avoid driving hassles and long waits when returning by parking in pay lots near the border and walking across. Taxis, buses, and private car hires are all available. If traveling to Tijuana Airport, Mexican airline Volaris operates a bus service between that airport and San Diego's Santa Fe Train Depot.
* For a delightful, low-key alternative, drive 60 minutes on the American side to the small border crossing of Tecate (home of the Tecate brewery). It's a short walk to the town square. Coming back, there are typically only a couple of people in line at the pedestrian crossing. You can easily combine a trip to the train museum in nearby Campo with a quick trip across the border for lunch!
* The greater San Diego County has a lot of smaller, more private beaches to the north (e.g., Del Mar and Encinitas), and some great small towns to stay in and explore. Carlsbad, about 30 miles north on I-5, is home to the popular Legoland California theme park. Further east, the Imperial Valley and the California Desert give a change of scenery.
* Julian is the largest and most popular mountain community in San Diego County. Also, nearby is Cuyamaca Rancho State Park and Palomar Mountain which has a large observatory. Beware, on hot summer days, the mountains are actually warmer than the city (as they're next to the desert).
* It's also relatively easy to get up to Los Angeles and other points in Southern California. Interstate 5 extends through the San Joaquin Valley of California, Oregon and Washington to the Canadian border. Although slower, California Route 1 (Highway 1 or Pacific Coast Highway in most of Southern California) and the US Route 101, through the Central Coast, Monterey Bay, and the San Francisco Bay Area, makes for more of a pleasant and fruitful trip.
* There are no boats to Catalina Island (Avalon) within San Diego County. You'll have to go north into neighboring Orange County to the pier at Dana Point. By car, take I-5 to exit #79 Pacific Coast Hwy 1 (make reservations).
* Temecula Wine Country is located about 60 minutes northeast of San Diego and makes a good day trip. There are about thirty wineries(with tasting rooms) located fairly close to each other. One hour further is the mountain resort of Idyllwild which features shopping and outdoor activities in an alpine forest.