Monument Valley is situated at the biggest indian reservation in the USA , Navajo. The highest rocks achieves even 300 height. Greyhound does not go here. We rented car at Flagstaff and after this place we went also to Grand Canyon. Costs of the small car (Metro) was about 60$ with limit 200 mills per day. Sanction for each mil more was 0.25$.
Entry fee to Navajo Park is 2,5$ per person. You can take participation at Indians run sights tour. This tour is going also to the places where you are not permit to go alone. You can go by your own car just to some places along unpaved road. Along roads sometimes Indians sell their artifacts - jewellery, pottery, blankets,...