Near Southford, the Larkin State Bridle Trail is a 16 mile route which is not heavily used, but is shared by bikers and horses.
The best trailhead is off SR188, although a new parking lot is on SR63. To reach the western trailhead from Exit 15 off US84, south on SR67 for 0.5 mile. Turn left just past the tennis courts (part of Southburys Community House Park). Park here, and head across SR67 and go 0.4 mile down Jeremy Swamp Road to the trail.
Overall, Larkin State Bridle Trail is the 2nd most popular horse trail of all 11 horseback rides in Connecticut.