LA JOLLA. One of the world's most renowned aquariums, this facility dates to 1903 and features 30 tanks filled with a plethora of fish and coral species. The "Blue Planet" exhibit focuses on water's importance to life on Earth, and interactive exhibits include a display that lets visitors generate thunderstorms.

MISSION BAY. This is San Diego's most popular destination. View seals, walruses, manatees, polar bears, penguins, and of course, Shamu, the killer whale. The park also features Wild Artic, an exhibit dedicated to aquatic life from the polar regions. Although Sea World is a research center, they also offer a playland and rides. Best time to visit is in the off season or on a weekday during summer.