The Eliot Boat Basin in Eliot, Maine is a surprisingly interesting place for dog friendly hiking. On the surface it appears to be your average boat launch with amenities including large pavilion for events, covered picnic tables, playground and restrooms. But follow the trailhead behind the playground, and you'll find an approximately one mile trail that winds it way through old growth trees, past a small foundation, to the final resting place of two soldiers who served in the American Revolution. Then extend your hike by following the trail to the small beach with views of historic Frank's Fort Island.
Dogs must remain on-leash. Swimming is NOT allowed due to the strong current of the Piscataqua River. Also there is extensive erosion of the sandy soil where entire trees have fallen onto the beach below, so please keep a close eye on curious canines. Dogs are allowed all day. The park itself is free with two parking areas. There is a small fee for use of the boat launch. However, if you would like to take your dog kayaking, there is no fee for launching kayaks or canoes. Also a short drive away is the Eliot Dog Park at Frost Tufts Community Park.