Other than the trail into Whitehouse ruin, you will need to be accompanied by a guide to enter the Canyon.
If you have a 4x4, you can P/U a guide at the visitors' center.
I believe that they charge 8.00, or 10.00 per hour.
You, then, DRIVE into the Canyon & can access the ruins and pictographs, etc. Plan at least a whole day for this.
You can arrange, as well, to camp in the Canyon, and do some of the old hand/toe hold routes up the walls. Guide cost is predicated on time spent exploring, there's no add'l charge while in camp.