I go to Vegas almost every year — this year, I’m going in August with a bunch of guys — and just for grins, I’ve built this Google Maps mashup of lounges and bars where I’ve had good times on the Strip. Of course, the current Vegas ultralounge culture is too young and hip for me, but there are alternatives and I have enjoyed exploring them.
By the way, Google Maps just put out a tool making it easy to make these mashups. I recommend it highly.