Skiing park isn't the healthiest thing to do.
Shin bang is an injury like any other. Fortunately like most minor injuries, we can ignore the pain with analgesic and anti-inflammatory drugs if we absolutely need to. It definitely prolongs healing time to ski while injured, but if you really need to ski for a competition, vacation, or a sick pow day, numbing stubborn nerve endings with drugs is the way to go.
For complete shin bang pain relief, combine external application of Zhen Gu Shui with 800mg of Ibuprofen, and a gram of quality weed.