The Fort River Trail in Amherst, Massachusetts, is an easy 1 mile loop hike along a gravel and boardwalk trail.
A lot of the trail runs along a boardwalk, so it's handicap accessible and great for kids. There are benches every 10th of a mile or so, so you can sit down to enjoy the views or eat lunch.
Nothing special, but just a really nice hike through the woods in Amherst. Dogs are allowed.