I did one, though a little differently (I basically just went and got a job in another country).
I went to australia and got a job in a kitchen, then as a bike courier and all the while part time as a bike shop monkey. It was fun, and nice to be somewhere else. I went on my own when I had just turned 18 and it made me grow up fast.
Having been to Oz, Canada and New Zealand now I’d put Oz at the bottom of the list- it’s a strange country and while it’s fun the people are strange and it’s all too easy to get stuck in with the backpacker crowd who are almost exclusively morons. In New Zealand it was easier to meet real people and it was a lot more exciting. The locals were more friendly too, as well as biking being better.
Canada and NZ are similar but on very different scales.
It depends very much what you want to do. My aim was to get there, find a place to rent and get a job and learn some life skillz. That’s not many people’s aims on that sort of thing.
Plan where you’d like to visit, then find places to stay. Pick nice places- don’t skrimp too much some cheap places really made my time there hard. Nice places made it easier. Be prepared for your plans to change- you’ll meet people, want to do stuff with them instead.
Jobs wise, you’ll get a rubbish job unless you want to be a bike courier (yay!). When I say rubbish I don’t neccesarily mean unenjoyable, just a bit scummy.
You’ll enjoy it, it’ll be a larf.