Here's another suggestion for Houston. The shipping canal is cool in several spots, and some nice, for Houston, coastal shots down along the water near Kemah and Seabrook. Also the battleship Texas/San Jacinto Monument. Uh lets see....Up north on the way to Kingwood Cove golf course there's this really cool swamp with Cypress trees in it on the same road as the golf course. There's no trespassing signs there, but I"ve stopped and shot it sev. times without any problems as I stayed on the main road. It's pretty cool.
Anyway, those are some suggestions.