Denise,
Check the Marinas on Swan Creek and Rock Hall, We see lots of mooring balls whenever we anchor over there.
Also check on Wharton Creek.
Its another 20 minute to 1/2 hour drive down the eastern shore...but the places acccesable from there are worth it. rock hall, Chester, Paatabsco, Magothy, Annapolis are all a days sail from Rock Hall. Sassafrass is way north