Need to get in shape

I've started walking again, trying to get myself in shape for my upcoming snowboarding trip. I hadn't realized how wimpy I'd become since the winter break. Last time we were out it was awesome though. Even though I wasn't feeling 100 percent, I still had so much fun. Mostly I didn't challenge myself much, just took it easy. But towards the end of the second day I hit some small jumps, sort of inadvertently. I was taking a path that went through some trees, just working on controlling my board, but then there was a drop off. I was going pretty fast so I got a little air, landed it, then immediately had to make another jump. Landed it, and put on the breaks fast because there was a huge steep drop off. I felt like an Olympian.
I got really cold though. My gloves were damp and by the end of day two my hands were so cold it took 10 or 15 minutes inside to get the feeling back. The third day it was really nice out, sunny and warmer. I just didn't have it in me that day, I was pretty exhausted and just coming off being sick. Still, I think that's the first time I've ever had the opportunity to go snowboarding and turned it down.
I'm hoping to feel better and have good weather when I'm out again in a few weeks!