Learn more: idahoriverjourneys.com/ A 6-day river rafting vacation on the premier river in Idaho, the Middle Fork Salmon. Float through the heart of the Frank Church Wilderness, the largest wilderness area in the lower 48. Enjoy delicious camp dinning, incredible fly fishing, fun rapids, and breath taking scenery. Since 1978 Idaho River Journeys has been recognized as the top Middle Fork Salmon company, ranked #1 on Trip Advisor.