My friends and I (adventure seekers in our twenties) sought out a river rafting trip in Riggins, ID because we'd heard it is a great stretch of the Salmon River. It is indeed a great stretch of river - if you're looking for a leisurely jaunt rather than a wild ride. Mountain River Outfitters does list the rapids classification on their website (though really, even with the help of Google I was not clear what class III+ rapids might be in real life), so I do not blame them for the lack of rapids. My point for mentioning them is that although we were disappointed by the river, our MRO guide, Luke Moser, rose to the occasion.
Luke was fun and friendly, and quickly surmised that we wanted to get the most excitement possible out of our 1/2 day raft trip. When there was a lull between rapids he devised stand up raft yoga competitions, had us stand on one foot on the stern while he spun the raft in tight circles truing to knock us into the river, let us jump out and swim after the raft, etc. He was also great about steering the raft over to picturesque spots for our photo ops.
Oh, and the food was wonderful! The taste was no doubt amplified by the fact that Luke prepped it all while we frolicked in the river. Vegetarian options provided.
Tip to save $7: You do not need to buy those straps to hold on your sunglasses - the rapids are not sufficient to dislodge them.