I'll put in a plug for staying at the Museum
(with the caveat that I haven't done it for a couple of years) You have to be a member at the contributing level and anymore you need reservations. They have showers and electric and after they close down at night the grounds are still open to you. It's lovely and peaceful and very accessible to the town. There is a page on their website with information for boaters.
Chesapeake Bay Maritime Museum