I owned a resort at Vallecito Lake for 3 years. Having put on many miles on horseback in the Weminuche, I'm very familiar with the main trails from the Vallecito Lake area. Both are great hikes thru very scenic areas. If you plan to fish a bit, you can find plenty in the streams & lakes.
The Vallecito Trail trailhead is a few miles north of the lake area, and the Pine River Trailhead is farther to the east but accessed on the same major road.
There are also other trailheads on the Durango side of the range that will get you into the scenic Chicago Basin area. If I recall they are the Needle Creek, Animas & Purgatory trails. I packed forest service camps on the Needle Creek one but have never been on the other two.
If you want more specific info, ask away. In the meantime, here are few photos to get you psyched.
Vallecito River with the Weminuche in the background.

A view along the Pine River Trail
Granite Lake -- Pine River trail. It can also be accessed from the Pagosa side.
My buddy heading over the Continenral Divide on the way to Flint Lake from the Vallecito trail
My youngest son (he's now 56) & I at Doughnut Lake, Continental Divide via Pine River Trail. A couple of the mountains in the background are 14teeners!
