I've lived in the Houston, TX area for about five years and have only been doing this astronomy thing for about two years and so I don't have a lot of options on where to go to get to some really nicely dark skies. My back yard is right on the outer edge of a red zone on the light pollution map. I can get decent data using a CLS filter but there's just no improving on actual dark skies.
I've found a handful of dark sites here and there, several of which I haven't actually used yet and some of which I haven't been able to secure permission to be on the land.
One in particular that I've used a few times is near Somerville Lake. It's actually a small little gravel parking area for a Wildlife Management Area, which is public land and thus no need for permission to be there and it costs nothing to access it. The only draw back is that its in a very low lying area and things can fog up really easily. Dew on steroids! Here's the map coordinators..
So if any of you are near Houston and know of any good - preferably free or super cheap - dark sky sites within about a two hour drive of northern Houston metro area, please post them here!
If we get enough responses, perhaps we can plan a star party if anyone's interested in doing so.