Less than two hours from Mackay, the Salmon River — the River of No Return — runs big through a granite canyon. Here's the whole day, hour by hour.
Head north through the Lost River Valley and follow the river road toward Sunbeam. Watch for bighorn sheep on the way — Morgan Creek Road is a reliable stretch.
Twelve miles of whitewater through a granite canyon — splashy Class III waves most of the season, and June high water turns it up to Class IV. Outfitters at Sunbeam run morning trips daily in season.
Free, right on the riverbank where hot water meets the Salmon. Rock pools, river temperature dial-your-own.
Crest Willow Creek Summit on the drive home as the evening light hits the Lost River Range. Best free show in Idaho.
Great little B&Bs line the route — the Mackay Homestay, the Windysage Farmstay, or Challis Hot Springs, where the room comes with its own soak.