Do some searching in the Crested Butte/ gunnison area. The scenery is fantastic, summer wildflowers are abundant and there are lots of camping opportunities. For fishing you have the Gunnison River, Taylor, Blue Mesa Res and any number of other options.
Here's a good place to start.
Taylor River | Gunnison Crested Butte Colorado Vacation | Official Site of Gunnison County
Continue to Google Crested Butte fly fishing and you'll be surprised at the possibilities.