I would say something similar but not as extreme about Oz, and possibly Canada. In other words, I think I'd be very happy living in either, but I'm just as happy back home. The 'same old same old' bleakness is made up for by being close(ish) to friends and family.I can vouch for NZ, the only downside is you'll come back and will never be content in this country again.
I spent a month travelling around Oz on my own, and I've been to Canada twice, US 9 times, all on my own. Admittedly all of this has been hotels and organised transport, and some of it has been for work (meeting people at the destination) rather than play, but travelling around really isn't that hard. All I will say is that it's often more expensive on your own unless you go the backpacker/hostel/slum it route.
You need to be careful, especially now. Do you have anything more important that you should use that money for? Are you sure you'll get a job when you come back before running out of money?
But, as long as you've been sensible and thought it through rather than going on inpulse, then if you can, DO IT!