Seven Locks Local Park in Cabin John is next to the Palisades Swim and Tennis club. They share an entrance road. The park has facilities for basketball, soccer, and tennis as well as a picnic shelter, a children's playground and a forest area.
The cache is a good size bottle. Starting contents are a spiral bound log book, 2 pens, 2 hot wheels cars, and a Cutter's insect repellent stick