Clopper Lake is a very nice and pretty big lake in Montgomery County, Maryland. There is plenty of parking, and I suggest you look for a spot near the boathouse as that’s the first place to try fishing from shore.
That also is the easiest place to launch your canoe or kayak—they have a little ramp. Note: I would not try pulling a trailer into this area. The boat launch area just is not large enough to do that, and there are no trailer length parking spaces. One more matter: Electric motors are allowed; gas motors are prohibited.
I enjoy fishing there for pan fish and largemouth bass. The lake also has black crappie, channel catfish, and carp.
Kids can catch bluegill and sunfish by the boathouse with a bobber and worm. There’s a nature trail that goes around the whole lake, and at various places you can catch fish from the shore. There’s plenty of open green space so you can bring a picnic basket and make a day of it.
More details on Clopper Lake are at https://dnr.maryland.gov/fisheries/pages/hotspots/clopper.aspx.