We didn't plan a beach trip this year, so my kids compromised on a visit to Lake Grapevine, and they had a great time. The beach here is a bit gravely, but it appears clean. My kids enjoyed digging in the sand, gravel and all. There is a small roped-off area for swimming in the lake, and I think it went out to at least 8 feet deep, so it was decent swimming. Even though we went on a Saturday, it wasn't overly crowded - the $5 entrance fee probably keeps the volume down. The views are pretty. There's a good playground for the kids, and there are also boat rentals if you want to kayak. Lots of people bring awnings to set up their own shade on the beach. You can bring a picnic lunch.
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