The Norwottuck Rail Trail is a 11 mile (one-way) flat paved trail that runs point-to-point from Belchertown MA on Warren Wright rd to Northampton MA. This section of the rail trail is 2.8-miles out-and-back and runs through Belchertown connecting Warren Wright Rd to Station Rd in Amherst.
The trail passes through Amherst College which allows easy access to Amherst center. It also passed directly behind the Hadley mall and various shops along route 9 on the way to Northampton.
There are plenty of trails that lead to/from the rail trail, so it makes getting on and off of it easy.
Dogs are allowed, but must be leashed.