The Spy Gully Bouldering Climbing

Start at Gregory Canyon Trailhead, and head up the Amphitheatre Trail. Turn left onto a somewhat hidden climber's trail directly across from the first large (about 16 foot tall) boulder on your right (if you reach The Amphitheatre, you've gone too far on that trail. Double back, and look for the boulder and the climber's trail). Hike up the trail almost dead south, up the north slope leading to the First Flatiron. Eventually you will reach the base of The Spy. Hike up to the top of The Spy (with The Spy directly to your left as you ascend), and cross in over a small notch. You can also solo in from the base of The Spy, or by going up the First Flatironette, but it's very exposed, and I wouldn't recommend doing it with crashpads.

Edit: after making multiple treks up to the area, I must begrudgingly admit that following the Bluebird-Bell Trail to the First Flatiron climbing access point is significantly less strenuous and probably faster unless you're a strong and seasoned trail-runner/scrambler, ESPECIALLY if you're trying to haul up 4+ crashpads. The climber's trail leading directly to the First Flatiron is long and steep, and I had to sit down, rest, and chug water 4 times the last time I went up with crashpads. If you're just there to solo or your gear only consists of rope and anchors, then you're probably okay taking the climber's trail.