Hello Trisha

There's lot to do in vacations.. especially when you're going to be in class 12th the next year. You should explore yourself and other stuff related to whatever field you're interested in or to become in future. Read books.. surf net.. get information.. gain knowledge about it. Meet people who are experts in the field you want to choose as your career. Also along with this.. focus on your fitness and be active.. do some sports. By all this you can make the Best use of your vacations..! 

Hope this helps.!

All the Bestt !!!