This is one of the highlights of Las Vegas to me.  These are absolutely beautiful, day or night.  I can -- and generally do at some point each trip -- stay for an hour or three in the vicinity just to catch the full cycle of the various fountain shows . . . and occasionally catch my favorite (whatever it may be at the time) more than once.  And this despite all else there is to do and see around Vegas.  Even just hanging out by the pond (or whatever it would be) and enjoying the scenery is relaxing . . . and admittedly, the central and open location makes for some of the best people-watching too.