Make sure you bring rain gear and jackets, the San Juan Mountains are known to have afternoon thunderstorms in the summertime.... we got hailed on a couple years ago when we were down there for the 4th of July.
Check out Corkscrew Gulch as well, if you have the time. Its one of my recent favorites. It's pretty easy to put together some loops and go up one trail, connect to another and come back down into a town. If you make it to Lake City, stop by Poker Alice for lunch... good food.
Imogene is epic, one of my faves no doubt. If you find yourself in Telluride and you need to head back towards Ouray, look for Last Dollar Road. It's an easy dirt road but you can take, rather than driving the highway.
You could drive to the summit of Black Bear pass, and then a little ways down before dropping in to where it starts to get sketchy. At that point the trail becomes one way only and if you're not going down, you'd best turn back there. I wouldn't want to take a full size Dodge over Black Bear but I have heard that people have done it.