P.M.
Yep, Georgetown is fun and quaint, but not much to do for more than an afternoon. I actually had a x-country meet there in high school! I have rafted part of the CO river, but it was closer to Glenwood Springs - which is about 2-3 hours away. It was fun but FREEZING! So I would skip rafting - I agree that nearby Golden Gate State park is a great camping spot, also lots of hiking. There are lots of towns worth seeing along I-70 here. You could go to Breckenridge (laid back ski town) Idaho Springs (another small town like Georgetown) but they have hot springs there if you're interested in anything like that. Estes Park is a little more out of the way of Georgetown, but as a CO native, it's one of my fav spots in the state, and if you're looking for "must sees" in CO, Rocky Mtn Natl Park is #1. Golden is also a cute little town closer to the foothills (and near Golden Gate State Park)
hope my rambling helps! if you're planning to make a little vaca out of it I would suggest not staying in Georgetown, but if you're just going to be there for a short time to run, I'd say it's not a super exciting place. :)