I would really like to answer, but without knowing what you want to see, it is difficult at best.
We can get tired of vast expanses of rolling country. (Montana and the Dakotas)
We can get tired of driving a tunnel of trees. (The Natchez Trace)
You can only take in so many sprawling blue-green vistas. (The Blue Ridge Parkway)
The endless desert can seen truly endless. (Texas, New Mexico and Arizona)
After a few thousand miles water is just more water. (Great Lakes, east, west and gulf coasts)
Yes, it can get weary, but we have seen this. If you have not, then decide what you want to more from your "to see" to your "seen" list. You can't run out of list in just one life.
Matt