The holidays are usually a time to relax.  But don't get too comfortable.  Goofing off for the entire holiday may lead to slippage--that is you may forget some of the concepts you learned.  (Use it or lose it!)  Remember to read something everyday to keep your brain sharp.  If you are in secondary school, review your notes so you return to school ready to build on what you already know.  If you are in college, get organized and prepared for your next round of courses.