Most of the posts are dead on right.
The insurance necessary to CYA is along, enough to defeat the project unless it's an event only type of use. At that point, you can charge enough for the event to cover the cost of the insurance.
20 acres isn't enough to have a good trail system except for yourself and some friends.
If you get good insurance, you can get away with unauthorized activities, once. If you have a bunch of friends wheeling and someone get's hurt, your insurance should cover it, but then they'll cancel it.
Right now, getting 20 plus acres of raw land requires a lot more than just a good income. A house on 20 acres needs to be very substantial to get a mortgage. It must be worth at least what the land is worth or your mortgage company may consider it a land loan. Land loans require huge downpayments, if you can get one at all.
I know where a guy has 60 acres for sale in Buckley right now. It's on sale too as he's going through a divorce. The property is ideal (other that being wet).
I let people wheel on my land, but on a very limited basis, and I hope no one get's hurt.