People need to realize that when they sue the Government they are suing all of us.

Signs tend to negate the whole forest/wilderness experience but how far does it go now? Do we need a sign if someone was bit by a snake last week? What about when fluffy ends up eaten by who knows what? Poison oak? Sun burn? What of someone got rabies from a bat last year?

Maybe as they pay their fee they need to "sign" a long waiver:

There may be wild animals that can harm or even kill. There are trees that may fall. Bad weather can lead to injury. Exposure to the elements can have adverse effects. Off or on trail can be hazardous to ones health.....