My husband and I did this but we went with a private tour. We were really thankful we did. We only had about 6 people in our group. We watched the tours from the ships go by and were flabergasted at how dangerous it was with them. There was a whirlpool at one point. Our tour guide took us out of the river just before it and had us go back into it after. We waited on the shore and watched the cruise tours went by. Our tour guide ended up having to go and save several people who got caught in the whirlpool. He started to yell for the tour guides to help him and to watch their people. Our tour guide didn't leave us at all. He watched over us very carefully.