Ran into a bunch of good links for people who are into hiking and biking, and they’re locally based. You may want to bookmark some of these, if you haven’t already.
Oklahoma Earthbike Fellowship, http://www.okearthbike.com/
Oklahoma Bicycle Society, http://www.oklahomabicyclesociety.com/
Oklahoma Bicycling Coalition, http://www.okbike.org/
Oklahoma Trail Runners Association: http://oktrailrunning.com/standard.php?id=1
Oklahoma City trails: http://www.okc.gov/trails/
Tulsa city trails: http://www.incog.org/transportation/trailguide.htm
Muskogee trails: http://www.cityofmuskogee.com/shell.asp?pg=149
Southeastern Oklahoma hiking: http://www.friendsot.org/
And all about any trails in the state: http://www.trails.com/findarea.aspx?state=OK
So there ya go. A bunch of places online to look for your next Oklahoma outdoors adventure. Happy reading/planning/playing!