Another thing you could do, if you wanted to have a cool one day adventure, and feel like you really got away.... is go to the far end of Anna Maria Island, and rent one of the small shallow draft trimarans. Take a picnic basket and sail out to uninhabited Egmont Key. Hike around and eat at a picnic table under the light house. Less than 3 miles as the crow flies but a whole different world. check out this guy>>>
http://www.biminibaysailing.com/
p.s . edited to add, if what you actually seek is a true layout of the land, and all the inlets in the area, and you want to just devote a day, I would consider renting a center console or deckboat outboard from either the club at Marina Jack, Cannon's Marina on Longboat Key, or CB's on Siesta. (There is just so much to see....)