Replying to Duties as park crew?

Although i am usually at sugarloaf every weekend, there is a local hill close to my house, that has just about the worst attempt at a park i have ever seen. My friend and i were playing with the idea that we could talk to the manager and see if he would let us build them a park in exchange for free riding there, or something like that. We would be having fun building features and maintaining a park, while getting to jib all week then still ride the loaf on the weekends. Is there anyone who does something like this? and what kind of duties do you really have as part crew? this is just an idea and we dont really know if it will work out yet