I'm do for a trip down that way. When I paddled sea kayaks I spent a lot of time in your neck of the woods and I used to shoot 3 gun matches at St Charles Sportsman's Club just outside of Waldorf. There are a couple of parks that would work for a get together - maybe Point Lookout would work. Good places to ride too.
"For those who fight for it life has a flavor the protected never know."
USMC 65-68 RVN 66-67