Our rafting trip was very professionally done, and we had a very good guide (Stackhouse). He guided us through the rapids, pointed out wildlife (such as the osprey that followed us down the river) and told us about it, and led us to an enjoyable trip.
My only real complaint is that as we were getting on the boat, the guide told us that only 6 of the 8 people would be sitting on the sides and paddling. We have rafted multiple times, and we have never had the experience of "two of you have to sit in the middle and just ride." This was a big disappointment. There were two families of four, so each family had one person who just sat and rode. I advise you to clarify this before your trip if this is important to you. The "small boats" tour imply everyone is paddling.
The other thing to note is that this section of the river is relatively calm compared to other rivers we have rafted on. This is certainly not the fault of Mad River. They seem to have chosen a good portion of the river to maximize the rapids. However, if you are used to a trip with several class threes and a number of class two rapids, you will find this a relatively easy rafting experience.
I also advise you to get the wet suits. We went in late June, and the water was COLD. I can't imagine not having the wet suite and booties.
The whole family still had fun on this trip.
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