Just follow 50 from woodbury to CR 13 and take a right, coming from 520 you take a left, go down that road for a while and it comes up on your left after getting past the "tunnel" of trees, it clears up over head.
OCP is the best field around that i could ever find. It has great prices, awesome fields, and good service. The one downside i could ever find is......actually i cant. Its a great field, and has a lot of good people come out there. Everyones always nice and there to help you, and they have pretty much the coolest ref ever.