South of Twin Falls, there’s a whole lot of nothing in the 47 miles before you reach the Nevada border at Jackpot. One place worth a stop is the summer-only Nat-Soo-Pah Hot Springs (208/655-4337, $6), halfway to Nevada, where you’ll find a 104-106°F hot tub, a giant (125-by-50-foot!) spring-fed swimming pool, a 90-foot water slide, a tree-shaded picnic area and snack bar, and a campground ($20). Nat-Soo-Pah is about a mile south of Hollister, then three miles east on a well-signed road. There are a number of other natural springs in the area, so if you enjoy being in hot water, southern Idaho is a great place to explore.