This is one that Gotham uses and was sent to me some time ago.
For participation in the (NAME OF EVENT) ((NAME OF EVENT)), the undersigned hereby agrees to release and hold harmless all sponsors, trail guides, workers, volunteers, and owners of both public and private land where the (NAME OF EVENT) is held as well as the officers, directors, agents and employees of the (NAME OF CLUB) ((NAME OF CLUB) ). The above shall also be released from any negligent act or omission and shall also include any loss damage or cost incurred due to participation in this event. The participant shall understand and assume full responsibility and risk for any property damage, injury or death while participating in this event. In signing this release, each participant hereby agrees to the following: (A) The owner/operator certifies that the participating vehicle has been inspected & that it is in good working order. (B) That each participant has informed himself/herself about the event and the trails involved in the event. (C) That he/she has read all the foregoing Releases and Waiver of Liability and Indemnity Agreement. (D) Participants acknowledge that trail riding is hazardous, dangerous, and unpredictable. (NAME OF EVENT) Rules: 1. ABSOLUTELY NO ALCOHOL, DRUGS, CAMPFIRES, FIREWORKS OR FIREARMS ARE ALLOWED ON (NAME OF CLUB) TRAIL RIDES. 2. Equipment/Safety Requirements: Roll bar or factory hardtop, seatbelts for driver & all passengers, working regular and emergency brakes, spare tire, fire extinguisher, cb radio, hi-lift jack or equivalent. 3. Authorized agents of (WHEELING LOCATION) and (NAME OF CLUB) may disqualify any vehicle at any time for safety reasons. 4. (NAME OF EVENT) is a family-oriented event. Participants are expected to conduct themselves accordingly. Any violation of these rules may result in expulsion from the event and forfeiture of all entry fees. THIS WAIVER MUST BE SIGNED BY ALL PARTICIPANTS For a child under 18 years of age, both parents, the parent with legal custody, or the minor's legal guardian must sign this release form and write the word "minor" and age next to the minor's name. I, the undersigned, have read and understand the above and agree to abide by same. ________________________________________________________________________ Participating Vehicle Make / Model / Year / Plate# ________________________________________________________________________ Vehicle Owner Name (Print) Driver's License No. & State ________________________________________________________________________ Owner Signature Date ________________________________________________________________________ Driver Name (Print) Driver's License No. & State ________________________________________________________________________ Driver Signature Date ________________________________________________________________________ Passenger 1 Name (Print) Signature Date ________________________________________________________________________ Passenger 2 Name (Print) Signature Date ________________________________________________________________________ Passenger 3 Name (Print) Signature Date (Use back of page for more if necessary)
, so I tend to look at things very conservatively. You really ought to try and get some sort of form liability waiver and try to get it signed by all participants EVERY time you go out. These waivers aren't as useless as they were back in the 80's. Some of them are pretty good now. 
