Easily the Four Seasons in Vegas. We were originally staying at Mandalay Bay (it has most lower floors of the same building and the Four Seasons is the top floors) but they overbooked significantly. They offered to put us up in the Four Seasons instead. With five of us it was difficult enough to even find a room to give us, so what did they give us? The Presidential Suite, big and the one with a 180 degree Strip view. Regularly goes for about $3000 a night. It was awesome. Really enjoyed the Hutton in Nashville too, though.