There are a lot of reasons to like downtown Las Vegas these days. It simply has personality.
But the other reason to visit downtown is to go to Bangers. Their beer selection is fantastic, they have beer flights, the staff is both friendly and helpful and the atmosphere is casual.
If you haven't had a sour beer before, make sure you add at least one of them to your flight. Even if you don't think you like it at first, you'll be surprised how much sour beers grow on you.
Beyond that, just take the advice of the staff and you can't go wrong.