There is a little less than 400 miles of Route 66 through Oklahoma. We like to say 400 because the first alignment through the state was 415.
Information from Route 66 AssociationThere are two Route 66 museums west of OKC, one (Elk City) affiliated with the National Historic Route 66 Federation, the other (Clinton) with the Oklahoma Route 66 Association.
Both are worth at least a half-day's visit. They have two different stories to tell. One is the story of Route 66 as a whole, and what it meant to the patterns of migration in the first half of the 20th century. The other is the story of the development of the route in Oklahoma.
There is a lot to do and see in the state, not all of it along Route 66. Much will depend on your own interests, and just where you will be.
Things to do in Oklahoma.My interest is history, which means I visit a lot of small museums and libraries. There are more than 200 museums in the state.
I'm not sure what you mean by "sites." We do not have a lot of places built as tourist attractions, not natural "wonders" like deep canyons, though we have some places with waterfalls.
We have perhaps the largest variety in geological/biological zones, from mountain forests through tall and short grass prairies to scrub lands, deserts, and salt plains. Some of the areas are small, in the western part of the state you will see mostly shortgrass prairie and "breaks" where scrub trees intermix with grasses.
If you are interested in Native American history and culture, there are tribal headquarters, usually with libraries and museums, for at least thirty nations or tribes. Six were native to the territory that became the state of Oklahoma, the rest were relocated here during the 19th century, sometimes displacing the local tribes.
Tom Test
Itasca Spirit 29B