Las Vegas

You start your journey through the mysterious realm of deep water at the ruins of an old Aztec temple. Here the heat and humidity may be uncomfortable for humans, but it's quite nice for the golden crocodiles, endangered green sea turtles, water monitors, and tropical fish. Descend through two glass tunnels, which lead you deeper and deeper under the sea (or about 1.6 million gallons of it), where exotic tropical fish and other sea creatures swim all around you. The tour saves the best for last—from the bowels of a sunken galleon, sharks swim below, above, and around the skeleton ship. Elsewhere you'll find something like a petting zoo for marine life plus a special jellyfish habitat. www.mandalaybay.com. COST: $16.95 adults, $10.95 under 12. OPEN: