If you haven't already searched the Locations and Conditions sub forum, try that. A lot times people don't check in very often, or may have gone to
other activities so the chances of someone posting an answer may take a while.
Oklahoma has some active kite buggy riders so you might check into where they go if not too far.
Finally, many of us simply get out Google MAPS (aerial views) or similar and start searching for parks, parking lots, lakes, etc where there is space
big enough to kite buggy. The bigger the better. Once you find some promising looking places it's time to drive there and see if they would work.
You want something open (w/o big trees, buildings, etc) in at least one if not more directions. Abandoned airports, fairgrounds parking areas, large
parks, beaches at lakes and even soccer fields can work. Good luck.
Landboarding with kites is another option, which less space. You might also search for info on "Street Kiting" which is mainly done in paved parking
lots.
Good luck.
NPW Test Pilot -US99