What to do in Vegas?

So we are planning a one-night stop in Las Vegas for our ultimate anniversary road trip...

Any ideas of what we should do or see while there? Good restaurants? Cool/funny shops? Any shows that aren't too expensive? Exhibits? Attractions? Anything! We can always stroll the strip and watch the water show at the Bellagio for free, but I want some new fresh ideas for this vegas trip.

Hit me!