I looked it up and a lot of words that mean "trick" come back so I'm sure which is the right one.
Question Overflow made a good point.
招式 is often used for 'tricks' in sports like skateboarding - so in theory it should work with snowboarding just the same. You can even shorten it to just 招 if you'd like -- might sound a bit kung-foo-y though...
edit: some extra info:
see this article
the article talks, mainly, about ski + snowboard tricks the article features the word 招式 a lot：
Tricks here means 'maneuvers performed for fun or for show in a sports game'. It's translated into
花式动作 in Chinese.
Sports games for the exhibition of tricks is called
freestyle snowboarding is
figure skating is
exhibition basketball is
In your context, "技巧" is a candidate.