Or just keep your eyes open. There are ranch supply stores and even old-style dry goods mercantiles that sell hats in every town in Greater Yellowstone. D is for diving into a commercial hot-springs pool. This country is full of them. No matter where you go, look for the cool pool, too.
Nothing's better than going back and forth between the two extremes.
Located right next to the Bozeman Hot Springs KOA, this hot spring features a small pool outside under the big sky or a big blue pool inside. If Mom and Dad aren't in the mood for swimming, they'll love sitting poolside sipping lemonade while they watch you dive. Near Jackson, Wyoming, try Granite Creek Hot Springs, way out in the woods with shaded picnic spots on nearby Granite Creek. More convenient is Astoria Hot Springs, also near Jackson. It also has a nice patio overlooking the pools for parents whose idea of a good time is a long, slow soak in the sun.