Perimeter Horse Trail is the longest trail in Kalōpā Native Forest State Park and Recreation Area and has a length of about 2.3 miles. As the name indicates, this trail is designated for horses but can be used for hiking a well. If you switch to Ironwood Lane (and later to Gulch Rim Trail) when you reach the southern end of Perimeter Horse Trail, you can form a loop and don't have to go back the same way.