Sooner State Cycle Park

[Dubyah]

 http://www.bakerboysokc.com/event_calendar.asp
 Baker Boys Yamaha runs it.
    It's located on 160 acres with two separate motocross tracks and a cross country trail system. The facility has giant grass pit areas for camping and mens and womens bathrooms with toilets and sinks.  There are limited "first come first serve" electrical/water hookups(10) for campers for 20 bucks a night.  This is a very spectator friendly track, offering various vantage points and some cool spots just a short walk away from the start.
   
  Looks nice, although it doesn't seem to be open too often. Spectators are free.

Follow the link above.

[Dubyah]

Sooner State Cycle Park
Sooner State Cycle Park - Wellston, OK

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SSCP holds Open Practice on most weekends when there are no races scheduled for the track - WEATHER PERMITTING

- Open practice sessions are from 10am-5pm and it is a come and go session - $15 per day per rider - Spectators Free - There are NO MEDICS ON SITE - 20 RV Hookups - Bathrooms with showers.

For Special Events - Gate fee $10 - RV Hookups $25.

You can Rent the track by the day: $500 per day with no prep or $1,200 per day prepped.
Sooner State Cycle Park located at 9743 South Hwy 177 near Wellston, Oklahoma. It is 2.3 miles south of Route 66 and 3 miles from Turner Turnpike(I-44). It is about a 20 minute drive to Sooner State Cycle Park from Okalahoma City.

I got this from there site.

[bigbear4x4]

it's no good for four wheelers, trails not really much wider than a bike in most places. i have rode and raced out there a lot on a bike, grew up bout a half mile south of there, but it is a pretty good place to ride and race on a bike.