We took the trip in May 2010, as a consolation because our trip to Holland and Belgium to see the tulips was cancelled due to the eruption of the volcano in Iceland. We took both the Antelope Canyon and Mesa Verde. In our opinion, those should be taken, because if you don't there's nothing else for you to do, although the experiences were satisfactory. Antelope Canyon is a slot canyon and we got some very impressive photos as a consequence. Mesa Verde is an architectural wonder, which we got to explore if we were willing to walk down and up.
The weather in May was generally cool; we wore Grand Circle jackets with either a fleece or sweatshirt underneath and it was sufficient, despite the fact that we had some snow on leaving Grand Rapids. We also had some sufficiently warm weather to justify the shorts and short sleeves we brought. We were disappointed with some aspects of the trip, however. We visited the North /rim of the Grand Canyon, which is not nearly as impressive as the South Rim, and was a major disappointment for most in our group. When we visited Monument Valley, we didn't go in; we just saw it from the road. In our opinion a very cheap way for Grand Circle to advertise that you see this. It was especially disconcerting because it would have cost just $2.00 additional per person to actually bring the bus in to the concession and ride around up close. We did have excellent accommodations when we went to see Old Faithful. It was only a couple hundred yeards from our hotel to the geyser. If we wanted, we could have gone to see it at night( when nobody else was there, as it erupts with regularity.