Joe's Simulator is a really solid boulder for the area with holds that are reminiscent of Joe's Valley climbing.
Take Little Park Road heading towards the Colorado National Monument approximately 3 miles. Park at the Lunch Loop trailhead on the left, just after the last house on Little Park Rd. Hike down the Holy Cross Trail, then take a right at the first fork. The trail sign will read Preup to Holy Cross, go right. This will take you to a ridge overlooking Upper & Lower Holy Cross Trail. You're within 1/4 mile of the boulders.
Dropping into the right side (east, or the side that faces Little Park Road) will put you in the vicinity of the West Side Boulders, where the Holy Cross Boulder and Joe's Simulator Boulder are.
Approach time is 20 minutes.
See the beta map photo for directions.
Approximate location via GPS is:
Latitude: 39° 2'2.53"N
The location is approximate but within two minutes' walk, North or South of the location, or up toward the road, or down toward the valley.