Great hiking, unique physical features.
From Idaho Falls, travel north on Highway 20. Turn left on Menan-Lorenzo Highway just before Highway 20 crosses the South Fork of the Snake River. Drive west on Menan-Lorenzo Highway for 5.9 miles, and then turn north on 3600 East. After 2.2 miles you will cross over the Snake River and the road becomes Twin Butte Road. Continue north on Twin Butte Road to trailhead.
http://www.tripleblaze.com/trail.php?c=3&i=8245