I'm still a big fan of the light rail! Sure, I can't use it every day, but it's about the only thing that will get me to head to downtown for a night out.
It's perfect for pub crawls, you can gather a huge group, keep everyone more or less together, and make frequent stops. The extended hours mean more time for drinking!
The trains have stayed clean, they run when they are supposed to, and I've never had a problem. The people watching is awesome as well. Each stop is a mystery grab bag of the teeming masses of people here in town.
I just wish it had a wider range, I'd use it every day if I could.