Hot Sulphur Springs Resort & Spa

In a town actually called Hot Sulphur Springs, this resort runs 20 gravity-fed pools plus private baths, with water the operator describes as natural and untreated. Know the lightning rule before you go, because every pool and shower closes whenever a strike is within five miles. The resort opens every day of the year, 8 am to 10 pm, and the public pools are walk-in only; book ahead just for rooms, massages or a private bath. Adults pay $30 or $35, and late entry after 8:15 pm drops to $17, a fine deal if you're passing through in the evening. Last walk-in is 9:15 pm.