Fodor's Expert Review San Diego-La Jolla Underwater Park Ecological Reserve

Four habitats across 6,000 acres make up this underwater park and ecological reserve. When the water is clear, this is a diver's paradise with reefs, kelp beds, sand flats, and a submarine canyon reaching depths up to 600 feet. Plunge to see guitarfish rays, perch, sea bass, anchovies, squid, and hammerhead sharks. Snorkelers, kayakers, and stand-up paddleboarders are likely to spot sea lions, seals, and leopard sharks. The Seven La Jolla Sea Caves, 75-million-year-old sandstone caves, are at the park's edge.

While the park can be explored on your own, the best way to view it is with a professional guide.