Rob - if you want some waivers, I can draw up something for you with limits of liability and indemnifications.

Here's the thing to understand...a waiver won't eliminate exposure to suits. Generally, waivers signed and handed out the day of an event are not worth much in court because the signee didn't have a chance to consult counsel. Regardless of what the waiver says, it is unlikely to protect you from your gross negligence. Your best defense is assumption of risk on part of the participant, and the waiver can help establish assumption of risk. You have a stronger argument if the participant is informed of the route ahead of time.