Took a trip to the Edge of the World, in Riyadh - Saudi Arabia with Riyadh Tracks ( www.riyadhtracks.com ) and would highly recommend their drivers and guides, as well as the itinerary which included a campfire and dinner.
A great 9 hour round trip seeing one of the wonders of Saudi Arabia.
We stayed in the Marriott Courtyard in central Riyadh after driving from Jubail earlier in the day. The guys picked us up from the hotel at 1:30 and dropped us back there afterwards around 10pm.