I agree with not using PVC pibes, they will be destroyed in no time if your park sees any kind of traffic. The really thick, heavy PVC pibes might be alright, but they're as expensive as rails are.
Try hitting up scandinavian rails or Northern rails. They might have some stuff laying around that you can get for cheap.
And as Nashoba said, you need to make it clear to management at your resort that this is a good investment, so that you get to do this next year. Ways of doing so is for example not to forget the kids and beginners, make sure there is stuff for them as well, and avoid a elitist freestyle vibe in your park, management people don't like that shit.
Out of curiosity, where is this going down?