I have a Jayco 28bhsw TT and a 2500HD. Traveling with wife and kids, 2 and 5(they're troopers, trust me). I'm hitting a friend's place(private campground) near 76 falls in Lake Cumberland heading sout...
There's a few tubing options. It's good fun for sure. I don't know about tubing right at the KOA. Most start a couple of miles away.
Joyce Kilmer is off near Murphy. The play is in Cherokee proper. Buy the tickets in downtown and the show is a short drive up the mountain. My parents took me to see it when I was a kid and I never forget it.