You have to check in at the welcome center at the traffic light. Very easy to miss. We chose the mesa top tour. We should have chosen the cliff face tour. The tours are two hours and were pricey at $100 for 4 of us. Our guide seemed knowledgeable but I have to question the accuracy of his knowledge. Very surface knowledge and many things that he didn't know about which I know scientists have the answers for.
I recommend other dwellings. I was not impressed and neither were our kids (11,9,8.5).