We went on the 4 Peaks Adventure this afternoon. It was an awesome time, so glad we went. We met in Fountain Hills and clambered into the Hummer. There are 2 sections - one open air on top and 4 seats in the back. Our guide Robby was excellent. Great job on pointing out the various cactuses, the many amazing features of the hummer, and he didn't sound like he had done it a million times before.
He had a lot of experience with the vehicle, which helped make it pretty comfortable. I was nervous it would be bumpy and painful (since I have RA) and I was absolutely fine. Although there were moments I squeezed my eyes tight shut when he did the thrill part of the ride - going down and up the steep hill ... but at all times I felt perfectly safe.
Beware of the teddy cactus - it blew on my shoe but Robbie & MH got it all off. Scenery beautiful - lake beautiful - you really get a sense of how difficult the land is to traverse and survive in. Good tips on the nutritional value of cactus. You will get dusty and there's no bathroom break for at least 2 hours so be prepared. But it's so worth it.
Water and snacks were provided, and he even offered them to us again at the end for our ride home. Also he took photos of us, and presented each group with a photo tour CD which included the ones he took of us. All made unobtrusively from the car.
He does ATV-ing too. You will have fun, probably even if you don't think so at first! Can't recommend it highly enough - I would go again, esp. on the night tours they also offer. Wish I was here to go when the desert blooms ...