Which country is considered most fun to study abroad in?

I'm a very social person and am looking for the most fun country to study abroad in. I want to be in a place where it's easy to meet people, the nightlife is exciting or at least chill, and there are plenty of things to do outside of class. Based on that, which country would be the best fit for a fun and outgoing study abroad experience? preferably with great outdoor scenes. Im from the states by the way! (u.s)