My girlfriend and I will be in Annapolis next weekend for a wedding.  She's a bridesmaid, so I will have the better part of a morning and afternoon to kill that Friday while she's at the rehearsal.  Anyone familiar with the area have recommendations for things I should do?  (Preferably at least one thing involving crab cakes.)  Because I am a nerd, I already plan to stop by the St. John's bookstore.