Housed in a former warehouse in the West End district, the Dallas aquarium not at Fair Park is a good place to hide out from the sun downtown. My niece and nephew enjoy communing with the stingrays, sea turtles, sharks, and reef fish. Their favorite, though, is "Orinoco -- Secrets of the River," an immersion into the tropical rainforest of Venezuela, a cool area teeming with Peruvian squirrel monkeys, endangered Orinoco crocs, jaguars, and soft-billed toucans. The newest exhibit is "Mundo Maya," with a 400,000-gallon shark tank. Plan on about an hour's visit. A restaurant and a cafe are on the premises.