I don't want to be a spoil sport - but need you to check a few things. That area has gotten a lot of garbage wash up from Galveston - and my understanding is that they haven't got it cleaned like it needs to be. Please call there and check on this. All areas keep getting better, but it's important to know. Our beaches were all cleaned - and with the high tides this week, got yucky again - not nearly as bad as before, but still yucky. Rumor here is that Padre is worse (or maybe just hasn't been cleaned up as well.)
Second, the high tides with the erosion from the hurricanes, have made some beach camping not as good as some other - so, again, keep this in mind. I suggest you go and take a look, and then decide.
That said, I'd go and give it a try - but always remember to keep watch on the tides and what is expected - because there will be times you might have to move off the beach (remember when Sparkle should have
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One area that I'll go back to beach camp again is in Magnolia Beach in Port Lavaca - which has beach camping. And right behind that beach is a campground (10 spots, I think) that RetiredHappy is going to in March. That's a boondocking beach that I also recommend down here. I do not know if they have a dump station - didn't look for one - just took a night at the little park - filled tanks, dumped etc.
As to you and boondocking, I don't see you having any problems. The biggest thing you'll have to get used to is not being able to take showers as often - getting used to really limiting your water use. And don't think of letting your grey water lose - if you get caught - you'd not like the fines.
Oh, in TX - where I am - you need to have a $12 sticker for all vehicles that park on the beach (except in a couple designated "free" parking areas) - so check on that where ever you go - $12 is nothing - but the fine if you don't have it - is like $200.