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 ($5; 208/655-4337), halfway to Nevada, where you’ll find a giant (125 by 50 foot!) spring-fed swimming pool, a 90-foot waterslide, a tree-shaded picnic area and snack bar, and a $12-a-night campground. 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.