If your idea of a great vacation means being by the water, visit Bay Island. Whatever you choose to do here, you're unlikely to get bored of those lovely views.
When you've spent a bit of time at this Siesta Key water-surrounded land mass, why not make your way to Siesta Key Beach, St. Armands Circle, and Mote Marine Laboratory & Aquarium? They're close to Bay Island and also a favorite with travelers.