I find R1 is a great experience and makes you a better boater overall. However, it depends in when and where, we were R1ing the Minturn Mile when it was in, I wanted to do Dowd Chute, but i missed the window, it would have to be less than 3 feet imo. Numbers would be really nice right now, but you better know all the lines, Browns canyon would probably be a great place to start or better yet, I'd say Parkdale. Its my goal to do both numbers and the Gorge eventually, but again, at lower flows, with a buddy or two (they could be in rafts or kayaks, but are there to help you if needed. Also, I've guided on the Ark for 12 years, so i know all the lines at various flows. Just don't go to high water or you could be sorry, because thats when the river will really push you around, an old buddy would put a heavy cooler in the front as a ballast, but I don't think its needed. Cheers, and with anything else in boating take it easy to begin with and go with solid people who could help you out.
Other great sections could be gore creek, some sections of clear creek, middle eagle, lower eagle, just avoid any sections with a ton of flat water in windy conditions, ha you'll be blown back to the put in. And my vessel is a 10' White Hyside Mini Max.
Oh and be ready to High side like a spider monkey.