A little more......Point Lookout Marina is 61.5nm from Quantico Creek per Navionics, the restaurant at PLM is Sunset Cove, check for open hours, and when I stopped there, Chef Andy served me my all time favorite crab cakes. Nice folks, good fuel price, pumpout is on the fuel dock, and the marina is well sheltered.
Noting a posting to this link from Reedville, that's a great stop, anchor or find a boatyard. We had a great view of a memorial tower - nicely re-purposed smokestack from Menhaden fishery days, beautifully lit at night. We tied up at a boatyard across the creek from the memorial, paid a reasonable fee at the boatyard for the dock space (not a marina, shower was primitive, but we were glad to be there), and we saw some beautiful hand crafted wooden workboats under construction - wonderful experience at what I feel was as authentic a location off the Chedapeake as one could find. Reedville is a step back in time. Didn't eat near the water, so I can't speak for food, but my fine crew on board said the restaurant at the head of the harbor was good, but closed on the day we were there. Reedville is another well shelterd small harbor, and we were ducking August storm cells - a tornado warning chased us off the bay (early August, 2017).