Lake Needwood is a 75-acre (300,000 m2) reservoir in Derwood, Maryland just east of Rockville, in the eastern part of Montgomery County that is located on Rock Creek.
Once I followed the GPS to the address, there is a few car parks, I followed the sign to the trailhead carpark. There are a few trails, there is a 13.5 miles for bikers and hikers to Washington DC. I took another one that is supposed to be around the lake. I thought it was call the Blue Heron Trail, but it is not on the link today when I check it again. In any case, I was lost, the signage was poor, there are detours all over the place, because the park is going through some construction.
The lake is nice. There is a boating area where you can rent kayak, row boat, pedal boat, canoes and there is boat tours as well. You can just show up and there is a little house by the lake where you can get things arranged.
It is a nice Sunday out but I wish the signage could have been better.