Israel Cruces, Jack Fieldhouse, and Stu Smith invested a lot of time developing the UFO Boulders in secret. They have moved on and the area is no longer secret but the information about the area has not been disseminated.
I’m starting to gather information. This map is a start and should help you get to some of the classics of the area like Hueco del Norte and Spoken Word.
From Highway 99, descend the obvious trail. After a few switchbacks, cross a creek. The trail will rise a bit to the “Welcome to Area 44” sign. The trail to the rope climbing cliffs goes up to the left. You want to go just behind the sign and follow a faint trail to the right that traverses the hillside.