We took a pretty cool trip to the Wichita Mountains National Refuge early October, looking for open spaces to ride. Its open / no fees unless you want a camping spot overnight, RV's only right now, no tents. Easy drive from Houston, about 6-7 hours. You can see Prairie Dogs, and Buffalo, and ride your bike up the highest mountain in OK, Mt. Scott. Good views. Pretty country. Traffic is very light. The RV Campground was booked solid though. We also visited the "Bone Museum" outside of OK City. These bones are whale bones, and YES, they do put the bones in a vat of insects, you can watch the bone stripping onsite. They also have a facility next door that does all this custom if you want it in your home.