Southeast of Twin Falls and south of Hansen in the Rock Creek Recreation Area, the South Hills has a huge trail network open to hiking, mountain biking, horseback and offroad motorcycle riding. The Third Fork - Heart Attack Loop Trail is a narrow, 13.7 mile route that runs through aspen groves.
To reach the Third Fork Trailhead from the intersection of US 30 and CR G3 (Rock Creek Rd.) in Hansen, go south on CR G3 for 21 miles. Park on the left at the Third Fork Trailhead.
Overall, Third Fork / Heart Attack Loop is the 10th most popular dirt bike trail of all 53 dirt biking rides in Idaho.