Hi Snowflake74,
If your website is about snowboarding then there are going to be multiple URLs that have the word snowboard in them outside the domain name. Your first example is perfectly acceptable. You should be designing your url structure for the best user experience not to manipulate Google or any other search engine. Do keywords in urls help. Yes they certainly do but are not as big of a ranking factor as your on page content.
I would stay away from blatantly stuffing your pages with the work Snowboard or versions there of. This is where spammy keyword selection can kill you. Not so much on the URLs. You do however, want to make sure your urls are short. The only problem I can see with your new structures is that the urls have a chance to be way to long.
Thanks,
Don