Houston Museum of Natural Science
One of the great natural history museums in the US and a full day if you let it be. The Morian Hall of Paleontology mounts its dinosaur skeletons mid-action rather than standing still, which changes how kids react to them. The Cockrell Butterfly Center is a three-story glass rainforest where butterflies land on you. Add the Burke Baker Planetarium, a giant-screen theater, a gems and minerals hall that genuinely dazzles, and an Egypt hall with real mummies. Several attractions are ticketed on top of general admission, so plan which ones you actually want.