Friends and I did the Half-Day Intermediate trip with really high river levels. It was a great time with lots of whitewater action but nothing terrifying. You definitely need to prepare to get wet with VERY cold water! The guides were amazing - both in their navigation skills and the information they shared about the various whitewater sections and the history of the area. My friends and I go up almost every year and try to go with Liquid Descent because we've always had a great experience. The facilities are a bit basic but I think most raft places are similar. It's great to pair a half-day morning trip with a well-deserved lunch & beer in Idaho Springs.