Yeah I'd maybe do up a proposal/letter outlining a plan of action. Focus on safety as that can have a MASSIVE effect on the bottom line.
1) I like the idea of a LARGE sign at the base of the lift, with "Park Etiquette and Park Rules" posted clearly. Mention that violation may result in immediate removal from the park and/or the resort. Stress to management that park etiquette is designed to allow for safe use of the park by all.
2) Again, the safe way to learn to jump is through progression. I can't stand parks that are all or nothing. If there's a better park at a nearby resort, mention them and say that we may lose business because their park has much safer progression lines. Progression lines make parks safe!
Good luck, your cause is just!