Every once in awhile I have days like that. It happens when I'm tired and in general just pissed. It always helps for me to ski some pow pow and then come back and be stoked to ride some park again. However, pow isn't an everyday thing, so I just have to hope there's some fresh. Go out and shred the mountain, haul ass through the trees, shralp the steelps, or lay down some long, fast, g-force inflicting turns on a groomer, it helps me a lot.