I can recommend White Rocks Marina, 410-255-3800. Mailing address is 1402 Colony Rd. Pasadena, MD 21122. it''s off Rock Creek on the south shore of the Patapsco River near where the Patapsco enters the bay. It''s about 40 minutes from downtown Baltimore, maybe 20 minutes from BWI Airport. They should be able to accommodate you for that period.