This is for the "Denali Wilderness ATV Tour" at 7pm. First suggestion, if you can I'd wait to book a tour based on the weather. The weather can change so quickly into rain as there are micro-climates in Denali. I booked mine within 48 hours of the tour because I saw the weather was going to be sunny. HOWEVER, continue to call the tour's number to ensure that they still have openings on your desired date.
Second, the office location was easy to locate and booking a tour was very simple (I booked over the phone instead of online). I drove and parked right in front of the store front.
Third, the ATV ride itself is awesome! The 7pm Wilderness tour the first week of June was a great alternative to the Midnight Tour (I was a week too early for the midnight tour). There is still enough sunlight to see the trails and to safely drive the vehicles. The tour guides were stellar, especially since it was just me and my uncle on the tour (yea, a surprise private tour!). Tyler and Jeremy (JDOT) were great in showing us around and describing the area. They answered all of my questions and took photos when I asked, which is something not everyone will do upon request haha. I would come back to do this tour and request these two again.