Hey Travelers, Where In The World Should I Spend Three Months?

I've decided I'm walking away from my job at the end of August to spend 3 months traveling. Where do you think I should go? I live in the US and have spent extensive time in Brazil. I've been to Europe twice. I guess it comes down to S. America, Europe and SE Asia. I'd be looking for a place where I can hop from one country to another while couch surfing without spending a lot of money. So, what do you think? Thanks!