I am a Germantown, MD resident; a few things to do. If you like nature walks, fishing, hiking, there is Seneca Creek State Park and Black Hills Regional Park; this time of year they have a winter lights show at Seneca Creek. There is a horse stable that does rides called Kings Valley Stables.
There are a number of restaurants as well, movie theatre, and nearby bowling alley. There is a sports bar/pool hall (Hard Times Cafe).
Sadly, no ranges lol; I go north to Frederick to shoot. Have fun!
IWLA Rockville is off Waring Station Rd.