Venice Beach (June 13) - We went at night and ate/drank at a beachfront restaurant/bar called Sharky's on the Pier (above). It was beautiful, but the sand fleas were out and I got pretty bit up. Sharky's is fun. Try the conch fritters. We will have to hit this one again during the day. FYI - this beach does not allow adult beverages.
Nokomis Beach (above) - You can bring your margaritas to this beach. The sand is not super white or fine, but the water is beautiful and there is easy access to parking (at least for now... it's not snowbird season yet) and showers to hose the sand off your feet before you get in your car. Just across the drawbridge over the intracoastal waterway (less than a minute from the beach is a great little restaurant/bar called Pop's. They have great food. Try the fried fish reuben, the fish 'n chips and the grouper fingers basket. It's a great spot to see the boats going in and out. There are always birds to watch and sometimes you get a show. The first time we were there a family trying to dock their boat at the restaurant had some problems. The mom ended up in the water and the boat police showed up!
Turtle Beach (June 27) on southern Siesta Key - Great shelling! I collected a jar full. Shelling is so much fun! The beach sand is coarse. The water was great and it was not at all crowded. There were showers across the parking lot. I don't know about the drinking rules. Does anybody else? Lunch at Turtle's Pub was a grouper nuggets basket. I LOVE grouper so much I could eat it everyday.