Not sure where you live in NE Oklahoma but 4 hours from Tulsa is the place where I go riding the most and that is Red River Motorcycle trails it is located in Bulcher, Texas. web site is
www.redrivermotorcycletrails.com
then there is Cross bars ranch which is located at Davis, OK
web site is
http://www.crossbarranch.com
and there is also a place near OKC just north of Draper lake that is called Cross timbers the associations web site is
http://www.okiedirtriders.com/index1.htm