30 miles north of Pocatello, Idaho on Interstate 15 is the Blackfoot Rest Area that has trails around the lava field known as Hell's Half Acre. There are trails at the rest areas on both sides of the highway, we were at the south bound rest area. There are two trails, a short 1/4 mile route that is wheelchair accessible and a longer, 1/2 mile trail. Nice to take a break from a long car ride with a quick walk around, though not sure I would want to walk very fast when it is hot outside.