Charlie--Aqua-land, by the Potomac river bridge and Goose Bay Marina. Both are in Charles County.
There is another in St.Mary's, on Rte. 5, down by Leonardtown. Plus Point Lookout State Park.
Another in Calvert, off of Rte 4 and on the Patuxent River.(Broomes Island area?)
Look for one around Wayson's Corner--I know there is one there but haven't seen it .
My books are all in the MH or I'd look them up for you.
With the exception of Waysons corner and the St. Pk,I can tell you--none of these campgrounds are 5 star resorts.
Point Lookout may be the nicest but it is a long way from civilization and (I think) it only has W-E hook-ups. Like I said--I've never seen the one around Wayson's Corner.