I don't know where this will go, but I thought I'd start posting my favorite boondock locations and see what others can add.
To start with, let's park on the Vail Pass summit, like 11,000', in one of the nicest little campsites around. There's a great little fishing lake, forest service outhouse, creek, and the bike path from Vail to Breckenridge runs right by.
Directions: Take the Vail Pass rest stop exit on I-70. Proceed towards the rest stop, but take the first right turn (heading west) on the south side of the highway. Go downhill about 1/2 mile, past the lake about 200 yards, turn left into the campsite. In the right photo, the lake is to the right and, no, that two-wheel track is NOT the entrance to the campsite--there are two very nice driveway entrances. You can't pass the camp--the road is blocked and only bicycles can go further along the trail to Vail.