If you are looking at island property near Wolfeboro, may I suggest checking out the Wolfeboro Corinthian Yacht Club. They have parking, valet service and an island shuttle service, not to mention a whole lot of other fun things. I belong to the WCYC and can answer any questions you have. OR you can check out
www.wcycnh.com About 1/3 of the memership are island owners.
Hope this helps.