Baaaaad idea! Bad idea! At least from my perspective. You'd be wasting a lot of time, time that you can utilize to finish school and do what you want along with it. Seriously, the last thing you would want to do would be to leave something hanging, a loose end that you aren't even sure you'll get around to tying up.
Take classes in the summer, winter, extra credits and get done. You can move on in life, there's so much you can do after getting done with school. If the limit is 18 credits/units, take 21 or 24 and manage your time well and fly through it. It's seriously not worth taking time off. If you're ahead, then that's another year you have. Look how much time you'll be saving by getting done as soon as possible, and it's not that time=money etc, it's that time wasted=time you'll never get back.