I was hoping Louis & Jonbill would post answers to this thread.
Corpus Christi,Port Aransas/Rockport/Kemah,Clearlake,Galveston have some decent Marina's. Galveston & Corpus Christi have some touristy things to look at and do.
I am boatless right now and all of my experience is boat camping/fishing in shallow-draft power boats and anything I would suggest could get you into trouble as far as where to go gunk-holing.
Right now we have a bumper crop of mosquitos on the coast from recent heavy rains, It takes a 10-12 mph wind to hold them at bay. Unfortunatley the wind at this time of the year is weak(under 10mph) and variable on the upper coast.
Spring & Fall are the best times to hit the coast here. With a close eye on weather, besides the end of hurricane season in the fall, we have cold fronts which can blow the tides out during the Spring & Fall,Winter.
Summer time is Hot with sun intensity growing the further down the coast you go, shade is a must and it should totally block the sun & UV.(those colored polys tarp will just cook you) However the winds are best during summer(SE tradewinds) until August, with intensity going up the further south you go with the Corpus Christ area having a consistent 15-20 mph winds, that's where most of the windsurfing,dingy,sailboat racing goes on.
If your a nature nut like me and don't care for Marina's or Tourist Traps then there is West Matagorda Bay(Port Lavaca,Port O'Connor,Palacios).
I hope I didn't confuse you!
