Great atv tour. We had never ridden atv's before and it was a great intro into how to ride and see some desert landscape. They pickes us up and returned is to the hotel on schedule. The only thing you need is suitable riding clothes. I recommend fairly sturdy shoes (running shoes or hiking shoes), long pants and a T-shirt, but what you need probably depends on season. Whatever you wear, you will get covered in dust so be aware of that.
They provided bottle water, helmets headstock and goggles. I brought my gopro and the helmet they provided already had a mount on it.
Great time and highly recommended.