It's hard to concieve that it's possible to have fun without drinking. So much of our society is based around drinking. "hoisting a few with the boys (or girls)" Celebrating a promotion, etc.
I didn't take too long though, that I found socializing much more appealing, when it was with others that didn't drink. Going to a dance, actually dancing and remembering where I parked. Not having to deal with pissed off friends and family the next day because I'd done something or other.
I love rock-climbing - can you imagine doing this drunk. 700 feet up and believing I'm the best climber in the world?