I was thinking about running up to Lake Murray in OK just to ride around the lake- a 25 mile loop on roads that is not supposed to be too hilly (fingers crossed!). Here the link to that side, but you might check around on the website for other rides up in OK. It sounds like a pretty well run group.
http://www.oklahomabicyclesociety.com/maps/murray.htm
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"be careful this rando stuff is addictive and dan's the 'pusher'."