I know what you're thinking. Hot springs in the summer? Turns out that there's something really refreshing about the experience. Of course, there are chilling cold pools right next to the steaming hot ones, if you must give it a go. I personally enjoyed the hot springs and then sitting out for a bit and taking in the beautiful scenery of Strawberry Park.
You can make the most of your visit by camping in the park or renting out one of their cabins for an overnight stay or two. You can even schedule massages during your visit.