Hemlock Gorge Reservation is pet-friendly. Spanning 23 acres along the Charles River, this spot offers stunning views of the water below. The main attraction is Echo Bridge, an historic structure that offers stunning views. You can bring Fido with you to enjoy a picnic at the park or to wander on the bridge. Dogs are welcome to join you around the area on a leash under six feet, as long as owners clean up any mess that they leave behind. Hemlock Gorge Reservation is open every day of the week from sunrise to sunset.