The Boys & Girls Club provides after-school activities for school children in Watertown. The club is open to children ages 7 to 18. The club has a gym and a pool where swimming lessons are offered. The pool is also open for adult swimming on weekdays. The club also runs basketball and indoor soccer programs. There is also a computer lab for members to do homework. Other classes, including painting, are offered.
Grist Mill Pool & Tennis Club is a private club, offering its members an Olympic size pool, equipped with a diving board and slide, a learning pool, which is a shallow pool with a maximum depth of 3 feet and a kiddie pool, which is equipped with sprinklers and things to climb. This facility also offers a schoolyard-quality jungle gym, a picnic area complete with gas grills and tennis, basketball and volleyball courts.