I don't live in grand county but I worked at the resort last summer and expect to be up there in early june for some paddling on the fraser canyon. I'm a class 3 boater, working on 3+ and hoping to try class 4- later in the season.
We have a group of paddlers from all over the state that boat together all the time- lots of front range boaters but there are a bunch from summit county and elsewhere as well. our website is www.coloradokayakers.com
There's trips planned all the time and you can post a trip you want to do and lots of people will respond regardless of where the river is!
check us out!