There are a lot of fun runs around the Druango/Four Corners area. What kind of boater are you (class II, III, IV, V?)
The town run is probably the most popular run (Class III, good play some float time). You can put-in at various locations depending on how much time you have. For a longer paddle, put in at the 32 st bridge (just look for the raft companies) and take out behind four corners river sports (there is a dirt lot behind the shop). For a shorter run put in at the 9th street bridge and run to four corners river sports.
If you want something more exciting (Class V) try the upper section of the Animus, details are on eddy flower
If you are up for a bit of a drive have a look at the Stoner Stampede