I don't know if this would interest you at all, but since you haven't gotten any responses, you might check out going to New Braunfels - you can go tubing on the river, and the Schlitterbahn is a lot of fun with one of the world's largest wave pools, and I believe they have a sandy beach if I remember correctly. Just in case you can't find a natural beach and lake that you like.
Thanks Volcanogirl-we have done tubing and really enjoyed it. We are still on the hunt for a relaxing place to read, get some sun, picnic and take the occassional dip. Will keep our fingers crossed for more input. I appreciate yours!
Good luck; I hope someone chimes in for you!
There is a beach that we noticed off the road on the way to the marina.
(Across from Silver Leaf Resort) There was a beach and many people had sand umbrellas. It looked like a good spot. Hope this helps.
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