We were in Vegas recently for 5 days -
Highly recommend the Mob Museum tour, add in a couple of experiences in the museum too (speak easy to try their moonshine and we did a forensics experience), really enjoyable.
Night time viewing of the Bellagio fountain and Bellagio's has a botanical garden inside thats quite spectacular
Grand Canyon West (don't bother with the skywalk, que for hours to walk on a glass balcony) and Hoover dam (can cover both in a day comfortably)
Re-do wedding vows with Elvis
Yep been there and done that except for the mob museum.
Saw Elton John there and have seen Penn and Teller there too , we go to the outlet stores at each end of Vegas. I did the zip line down Fremont Street.
For a laugh I may have to do the "hyper loop" consisting of Teslas driving slowly in a tunnel to get from one side of the road to another.