118 acres of conservation land with a fantastic all-natural playground featuring log climbing structures, balance beams, and a small stream for splashing — completely free. Designed for kids ages 2–12. Trails through the woods are gentle enough for toddlers and link to longer loops for energetic big kids. Bring bug spray and water shoes for the stream; parking on Old Bedford Rd. holds about 20 cars.

Address: Old Bedford Rd, Lexington, MA 02420

Google Maps: Click here for directions

Cost: Free