Rob,
I think some way of marking the seedlings would be a good idea. (Snow fence, signage, etc). We have a golf course here that lets snowmobilers on during the winter but they always had some putzes who drove across the greens and damaged them. This year I noticed they just circled the entire green(s) with snow fence. I don't know your layout but it comes in 50 ft rolls, is plastic so is reusable year to year, and can be put in pretty easily with T posts.
Thomas - with regards courts using common sense - if that were the case we wouldn't need tort reform. Just had a case here locally where an inmate (who killed a Deputy a few years ago while trying to escape) sued the prison he was being held in because he was attacked by another inmate and cut up pretty badly. He rcvd $75,000, presumably because the guards failed to adequately protect him. The family of the deputy he killed can't get any of that money because the statute of limitations is up. (The inmate represented himself, probably with the help of the nice law library the taxpayers supply to each prison). Courts use common sense??? Thats heracy!!!!!