GS1 and IndyRon, though many might not think this is for them, if you think it's going to be good for you, your riding and traveling style, GO FOR IT!
We did a group BUS tour of National Parks out of Vegas back in '07 and could have booked that trip ourselves. The Tour company even listed each hotel the trip was going to, Every side trip provided, all the details and I could have made calls to each and saved some money. We did Grand Canyon, Oljato-Monument Valley, Page, Bryce and Zion, (Didn't go to the Navajoe Bridge, wished we did).
But the "tour guide" for our trip turned out to be a college professor of history who's focus had been the US southwest. We took a group of 7 on that trip and were part of a larger group of about 30. We met many new folks and thoroughly enjoyed that trip. Was just looking through pics of that trip the other day, still makes me smile.
I hope we're riding through that area and see some of these tours!