US 89 is one of the most scenic highways of the west. In its early years US 89 went from Nogales, AZ in the south to the Canadian border north of Browning, MT. Along its way you pass seven National Parks, starting with the Saguaro National Park in Tucson and ending at Glacier National Park in the North. There are another dozen or so National Monuments and state parks to be seen. The history of the early west can be seen clearly in each small town that you pass.
Cache is best approached when traveling south towards Zion or the Grand Canyon areas. Those traveling north will have to cross the road, which can be busy at times. There is a turnout at the cache sight. Please make certain you are off the road to avoid the traffic.
You probably won't need a hint, but it is there for those who want it.