On a visit a couple of years ago, I had gotten my feet wet during a rain storm, and ended up with blisters because of this. I was going to take my shoes off before I got on Kali, but the CM told me I had to keep them on. I told the others in my party to go on without me, 'cause no way was I going to have wet feet and more blisters, and the CM told me (very discreetly) just to take them off and stash them in the middle once I was on the raft.