skiing is a pretty diverse sport in Southern California up to Mammoth.
A lot more mexicans are into snowboarding just because they also surf and skateboard but I know a few that have been trying it out.
Amongst my friends/people I know well enough, I'd say about 2/30 are black, 3/30 asian, 6/30 are some sort of mexican, 1/30 will be gay (less or more depending on the season) , 6/30 would be from another country, 12/30 would be your average white american.
Diversity exists, just need to go to the right places.