The tour lasts 90 minutes with no stops. There are multiple daily departures. We took the first tour on a Saturday morning with two vans operated. The tour is comprehensive and well done with a combination of live and recorded narration. You may buy tickets on Sixth Street at the Visitor Center. A lavatory is available at the Center.
My one complaint is that their vans are wrapped and that includes the windows. Besides the advertising benefit, perhaps it reduces heat during hot summers although that's speculation on my part. I think the wrapping diminishes your viewing pleasure and the taking of pictures. Apparently this doesn't bother others as this isn't cited in the other Trip Advisor reviews. If you're lucky, try for the front seat next to the driver and you won't have the problem. The wrapping issue is the only reason I rate this a 4 instead of a 5. Hope this is helpful.
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