This is a pretty neat site for those who think it’s nothing but a concrete jungle around here. Be sure to check their little Flash movie about what you can find near here, too.
Now of course, the 24-county area it covers is a lot bigger than just Houston, but everything here is within a two-hour or so drive, and there are ten different kinds of wilderness areas described on their interactive map. The idea of this site is modelled after that of Chicago Wilderness. Check it out.