I have not. My wife went there with her mom the week before and said it looked cool. We got out there on the wrong day at the wrong time and I forgot my camera. The surf was heavy and the water was murky. My 2 year old got tired quickly. we stayed for about three hours playing in the waves before picking up and heading home. going to try and go somewhere this weekend and get some pictures.
Yeah, picking the 'right' day is an issue for both snorkeling and shelling or collecting on beach walks. You want as little wind as possible for snorkeling (more comfortable and way better visibility in the water). But you want the day before and/or the day of doing a beach for shelling or collecting to be as windy as possible to wash cool stuff up on the beach!
My wife and I will be out helping with beach clean up along the Sanibel Causeway on July 5th. After the morning cleanup we will either go out on Sanibel and do a beach walk along the Gulf coast or go to the Bailey Matthews Shell Museum. We will try to get some photos.