I went with a bike touring group. The Snake River water level was low but there were still fun rapids with lots of splash. I rented the jacket wetsuit for $5 and highly recommend it. I also recommend using the offered windbreaker. Everyone, those in the office and the guide, were upbeat and pleasant. You can leave dry clothes on the bus when on the river. The office has a place to change into those dry clothes when you get back. Do it!
–SoBro