This is a great hole in the wall bar just a few steps out of the Freemont Street Experience, but still close enough to not get accosted by constant hobos.
There are two things that are great about the Griffin: The ambiance and the music. Every time I go in there, they have great music playing from a wide variety of eras and styles, so it's not all of that "in da club" nonsense from the time you enter until the time you leave.
The place itself is dark, a little gothic/olde-style, and has a cool atmosphere to it. The two fireplace areas are great. They also have a large back room that will sometimes have a live DJ.
The drinks aren't the cheapest you'll ever encounter, but they're still better than most Vegas bar fare. At least they don't water them down, so that's a real plus.
Overall, it's a great place to hang out with a group of friends and get a few drinks, while simultaneously missing that over the top Vegas pretention when you just simply want to have a drink and relax.