The Monterey Bay Aquarium south of San Francisco, California is one of the best Aquariums I have visited. The layout is beautiful and encourages you to explore. The views of Monterey Bay are spectacular and the outdoor and indoor spaces blend so well that you move easily from one to the other.
The exhibits are wonderful! (I'm a sucker for Jellyfish.) I enjoyed the Kelp Forest, the Splash Zone, Sharks and Rays and the Outer Bay. They have one of the best Kids areas I've seen with lots of chances to get close and touch sea creatures. You can spend a whole day exploring here. Lots of feedings and presentations, too.
The biggest challenge is parking. Be prepared to hunt for a spot and grab any space you see near Cannery Row. The walk is worth it. Check the website for parking suggestions to ease the search. They also run a free trolley during the summer.
The real attraction here is Monterey Bay itself and the great views from the decks at the Aquarium allow you to spot many local inhabitants. This Aquarium is a real delight. Don't miss it.