Houston? Not a whole lot, I live there, San Antonio, go to Six Flags, it's loads of fun, and if you go to houston, I recommend trying Spanky's, their pizza and wings are so good. Kemah Boardwalk is also fun and it's near houston, they have some good crawfish and gator bites (gator nuggets) there, forgot the name of the place, it was "the shack" or something, it's small
Edit: The crawfish place is called Crazy Allen's Swamp Shack