Assuming Oklahoma is in the plains
Most people usually think of Oklahoma as being flat and not far from looking like Kansas. You should come on down to Southeastern Oklahoma if you don't think we have some really nice bike trails. Lots of people for Texas spend a lot of time in my area.
http://www.ouachitaadventures.com/Tr...aversbend.html
http://www.beaversbendlodging.com/area_attractions.html