If you're in San Diego and you can afford an entire day, make sure you plan for a day with great sunny weather. The balboa park is a great free attraction. There are a handful of museums in the park as well some of the most beautiful gardens. They have various greenhouses housing the nicest orchids and anything from cactus to palm tree gardens. Expect to do a bit of walking since the park is rather large. Helps to bring along some bottled water for the day. While some of the museums cost money there are still plenty of free exhibits to visit. Some of the architecture is amazing and the masonry/stone work is breath-taking. If you do go visit, dont forget to find the one significant landmark. There is a tower overlooking the park which is the same tower of the Xanadu mansion in Citizen Kane. I'm a movie buff so I definitely had to photograph myself in front of this landmark.
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