My husband and I just took a trip down the Comal over the weekend. We started early, about 9:30 and avoided the big crowds I think. The water was lower than it typically is but we didn't have to walk the river at all and there are many places I couldn't stand. It was a great trip, there are so many places to rent tubes from too, they will drive you to the drop off and pick you up, bring you around again if you'd like. I don't know if it's the best place to tube, I love the Frio, but there is certainly more water in the Comal than the Frio, Sabinal, or Guadalupe from what I have been hearing.