if you don't have a group of people around you to go boating with I would suggest joining the CWWA (coloradowhitewater.org) and signing up for some of their trips. you can do trips with people at your skilll level and end up boating with them outside of CWWA.
OR, if you are really hot, another alternative would be to just go hang out at put-ins and ask people to take you down the river.
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