My friend and I were planning a road trip this past Summer to see lots of Oklahoma and I got the fun part of making the travel suggestions. I gathered lots of brochures and planned 3 different trips, one to the okc and southern area, including Turner Falls and a bit East and West of I-35 almost to the state line, one to Western and Northern Western Oklahoma including the Pan Handle to see more native american and natural geographic type things, and one that went East to Tulsa and all around North Eastern Oklahome over to I-40. My mom got sick and died so we didn't get to go but the plan is to try next Summer.
We choose the one to OKC and area South because we found more interesting things to do with the 4 kids between us.
As my main resource I used:
http://www.travelok.com/