Incidentally, if you did want a really good disclaimer, here's one I found from a local show here in DFW.
READ THIS WARNING BEFORE ENTERING THE HAUNTED HOUSE!
This haunted house reserves the right to refuse admission to anyone. You may experience intense audio, lighting, extreme low visibility, strobe-lights, fog, damp or wet conditions, moving floors, special effects, sudden actions, and an overall physically demanding environment. You should NOT ENTER the haunted house if you suffer from asthma, heart conditions, prone to seizures, physical ailments, respiratory, or any type of medical problem, or are pregnant, or suffer any form of mental disease, including claustrophobia.
DO NOT ENTER the haunted house if you are intoxicated, wearing any form of cast, medical brace, using crutches, or have any type of physical limitations. Do not enter the attraction if you are taking medications or using drugs of any type. You will not be admitted if any of these conditions are to be noticed by our staff.
DO NOT ENTER THE HAUNTED HOUSE IF YOU SUFFER FROM ASTHMA, HEART CONDITIONS, SEIZURES, OR ANY TYPE OF MENTAL, PHYSICAL, RESPIRATORY, OR MEDICAL PROBLEMS.
DO NOT smoke, run, eat, or drink inside the haunted house. Additionally, there is no touching of actors, customers, or props inside the haunted house. No video or flash photography may be taken inside the haunted house. You will not be admitted and will be asked to leave the property if any of these rules are not followed.
THERE ARE NO REFUNDS! ENTER AT YOUR OWN RISK!
Your ticket is a revocable license and may be taken and admission refused upon refund of purchased price. Holder of this ticket understands that there is inherent risk involved with attending this haunted house. The ticket holder voluntarily assumes all risks and dangers associated with participation in this haunted house. In consideration and acceptance of entrance into this attraction, the ticket holder agrees to release the operator, its parent corporations, affiliates, officers, directors, and employees, and landlord from any liability, harm, injury, or death, cost of expense whatsoever that may arise directly or indirectly, from attending this haunted house or any of the attractions at this location.
I don't know what copyright laws dictate about using someone else's disclaimer, but it might provide you with some ideas.
You know, for what it's worth and all.