If you need to ask what to spend it on... then you probably have no reason to be spending it in the first place. Save it and I guarantee you'll run into something later that it will be useful for.
at the dollarstore they sell a packs of 20 bouncyballs so i spent 20 bucks on just bouncy ball packs so now i have some400 bouncy balls just sittingaround in my room
this depends how old you are soo if you are 18 and under save up more money so you can go to a ski camp and if you are older then that ski tickets or save up and buy a season pass for next year