Canyons are inherently risky. Flash floods occur without notice on sunny days. Technical skills & surrounding topography knowledge required yet does not eliminate risk.
Start out by hiking up the closed road as if you were hiking to Frenchman Mountain. Hike up, up, up to the saddle (approx. 1.1 mi). Stop for a quick breather, then continue hiking the road down to the bottom - this is where the canyon begins. Turn right, leaving the road, and hike down the wash.
Shortly after, you will reach the first rappel. There are a total of 4-6 rappels, depending on the downclimbing skill of your group. The last rappel is the longest - 80 ft. Plenty of downclimbs between rappels to keep things interesting.
After the last rappel, continue down the wash a short distance, then catch a use trail to the left up and out of the canyon. Follow this trail onto a small ridge, where you will be able to see your vehicle. Use the maze of closed roads and use trails to return to your vehicle.
No shade and no water. Low elevation plus steep hike up. Be smart.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.