you'll only get bored if you let yourself!
i worked for half of my gap year, and went on a volunteering placement, for 5 months, and travelled for 1.
It was a bit hard at first with all my friends going to uni, I defo felt a bit left behind, but at the end of things, I made loads of friends from working (and also learnt a bit about the general public
), and had the most amazing time volunteering and travelling it was untrue.
travelling doesn't have to be expensive, it all depends on where you go and how you do it. I still have a fair amount of money left over after the end of this year, and whilst it won't exactly get me through uni, it all helps.
and, at the end of everything, I feel like I've had a life experince (not wanting to sound cheesy), i've grown up a lot, and will definately appreciate university far more than i would have done last year, feeling a lot more worldly wise than a lot of my close friends. Also learnt what it means to work hard.
and if a year out gives you some time to think over what you want to do in uni/finish an a level, do it. you wouldn't want to make the wrong decision, and it's not as if you're going to be behind everyone else if you apply a year later. loads of people do it.
hope this helps.