Also known as Aquaria 21, this excellent underwater-world aquarium features a "touch pool" so that kids can mingle with the sea life (crabs, starfish, urchins). The main tank is stocked with seahorses, tuna, turtles, rays, and patrolling sharks fed by keepers in diving suits. There's also an arena of penguins from Peru and Chile. In fact, you can journey through a series of aquatic habitats, from the Amazon River to Antarctica. Scuba gear is provided for those who want diving lessons.