Sanibel Island this summer

We'll be going to Sanibel Island for the first time ever this summer, and I'm looking for locals or other Sanibel lovers to tell me what they like to do, where to eat, where to shop, etc. We're interested in a boat excursion - I read about someone else who took a boating trip and had brunch on some other little island - that would be cool. We are staying at the Sanibel Beach Club, so anyone that has stayed there or knows the place, feel free to post a review. Thanks so much!