My first recommendation to keep up your snowboard tricks in the summer would be to go to high castcade snowboard camp. It will help a lot. You can skateboard, and snowboard. My second recommendation would be to get a trampoline, so you can practice bounce boarding. My third recommendation would be to get a snowboard addiction box, and a snowboard addiction board to practice olliieng on to boxes, rails. My last recommendation would be to skateboard, or surf. It helps with control, and balance. That is how you can keep your snowboard tricks up in the summer.