Roaring Springs Waterpark is a straightforward summer family stop in the Boise area, with big slides, wave pools, lazy-river lounging, and the kind of heat relief that makes sense in Idaho's dry summer. It is more useful than subtle: a place to cool off and keep children happy.
Go early on hot weekends, when lines can build quickly. For most travellers it is a half-day activity rather than a reason to visit Boise, but families on a road trip may be grateful for it.