I wanted to post in there but didn't catch it in time.
regarding "trespassing"...CR Swade, you were very fortunate to have so much land and have there be no temptation or reason to trespass. And on principal, I agree with you if it comes to riding on the neighbor's farm/ranch property etc. but geez...there are thousands of "don't ask don't tell" riding areas out there. "on paper" you don't have official permission and are technically trespassing, but as long as you don't bother anyone there are no complaints and/or the true owners look the other way. We can thank the lawyers for this. There is liability involved if they give you permission. For example abandoned open pit mining areas...the mining company's lawyer tells them they have to post it "no trespassing" for legal reasons.
Same thing in parts of Canada, my understanding is the state owns it and the paper company has the rights to it, ask anyone and they will say it's ok to ride as long as you don't get in their way or bother anyone.