If you like cars, Shelby museum and factory is good and free as well. We hired a car for the day to get there, it’s a bit out of town.
Car museum at the Imperial Palace.
Buffets, lots of buffets.
Gun Store is fun, but brief.
Make sure you go to Freemont, “old” Vegas.
Some amazing countryside outside Vegas, Red Rock Canyon is close and you can probably do organised trips to there. Hiking and biking – I did a half day road bike ride where they picked up from the hotel, supplied a bike, gave me a route and picked up at the end.
Helicopter rides – we did the one into the Grand Canyon, over the Hoover Dam and up the strip.
Play Blackjack, get free drinks while you play. The dealers are generally helpful to newbies plus you can buy a basic strategy card if you want to minimise losses.
Drive to/visit Hoover Dam.
Liberace museum is now sadly closed.
Gospel Brunch on Sunday at House of Blues (I think it’s in Luxor).