Maybe you're at the Stratosphere to catch a show or maybe you're there to take in the incomparable view from the top, whatever the reason, stop in to C Bar and just hang out for a while. It'll be worth it. Drink specials, a really cool vibe (sometimes putting it simply is the best way to put it) and some of the best people-watching opportunities of any place in town make up a place that's a great first stop for your night - or a place to spend your whole night.
One caveat though - if the rides on top of the hotel are part of your plans for the night, you might want to save that drink for after your thrills. Liquid courage might sound like a good idea, but after that first plunge on the Big Shot, you, and your stomach, will probably regret it.