Replying to Off season training?

I don't live in Whistler or a random place in Scandinavia so I don't have access to trampoline parks designed for training. Unfortunately for me, I live in Las Vegas, where there is no snow. There aren't any kind of synthetic parks near here either. What do I do to improve when I have virtually nothing to work with? I was looking into the Ski Addiction Tramp Skis, but the trampoline places in vegas are for kids and probably don't allow people strapping planks to their feet.
I don't wanna be stuck doing literally nothing in the off season. There has to be something that I can do that makes the wait more bearable and also makes me better before the season comes. Any suggestions?