The marina I keep 'Ohana in is there on the Yoecomico. If you are coming down the Potomac be sure to go the extra mile past the "Pancake" buoy before turning in unless it's high tide and watch for fish traps if you cut the corner. At the second green buoy, hang a right and weave back to where you see a bunch of covered slips. I don't know what he would charge to tie up there for a night but he's got basic restrooms. If you bear off to the slight left at that second green buoy Port Kinsale Marina is back there, they have full facilities. If you just want to anchor, take the right and there are nice coves. Watch for oyster boats in the channel but that goes without saying.
I see someone is prepping a Mac 25 to take the slip behind me.