I’d suggest:
Freemont Street Experience for two hours, especially at night. You will see scantily clad street performers, street magicians, classic rock cover bands playing on outdoor stages, people creating art, dirt cheap tourist stores, the overhead show set to music, people ziplining overhead, multiple casinos, multiple restaurants, all in kind of an outdoor mall setting, no cars, but there are one or two streets that run perpendicular through it. Usually lots of people around, especially at night. You’ll see ppl walking around with drinks, and smell weed. Some of the performers are fantastic - juggling, tin drums, magic, dancing, some of them just take photos with you for a few dollars, but they might only be wearing a diaper, or ladies in lingerie with whips, musicians. I HIGHLY recommend Freemont Street - it’s a scene, for sure.
From Freemont Street, go to Container Park for an hour - two hours if you like a drink, and popping into small shops. Definitely go at night, but try to plan it while the shops are still open. At night, you’ll wanna see the giant mantis spit fire into the air, set to music. Container Park has a stage at one end, and sometimes at night, they’ll have a band playing. There’s a few bars where you can snag a seat/table outside, and watch the band.
Vegas for food? If Korean BBQ and Sushi suit your fancy, you can throw a rock and hit an all you can eat version of both places with the same rock, same throw. It’s CRAZY. There is no chance I go to Vegas and don’t have AYCE Kbbq and Sushi. NO chance at all. Try to get off the strip for each and save money, but you can do both on the strip, or VERY close. Sushi and KBBQ competition is FIERCE, so, you’ll probably be just fine at any of them. My favorites: Sushi Neko, and Captain 6 - both are off the strip in “Chinatown.”
I love magic shows, so I am biased. I’d see one. Get on Groupon, and just pick one or two.
If you are there, and “Potted Potter” is playing - if you know of any Harry Potter stuff, PLEASE go see Potted Potter. Again, Groupon.
They have a newish version of Soarin - I think it’s called Fly Over. Groupon. They have a small handful of different flight versions to take. I’d go again, and probably will.
Red Rock is a good day trip - you can drive through, and pick which vistas you’d like to stop at and walk around. I wouldn’t worry too much about stamina. The vistas are marked, some have parking lots, and you can get out and choose how far you’d like to walk around, and take pictures. You can see what you are getting into, and where people are going - you do not have to follow them, there will be plenty of great views right outside of your car. There are a good handful of stops, too. All on a driving path. You drive the path, stop at a marked area, park, walk to the viewing area, or start of a hiking path, do what you want, then get back in the car, and drive the path to the next one.
You’ll prolly wanna do the whole iconic Bellagio Fountain (if they are still running the shows,) and then go inside for their themed flower display (both free.)
The Pinball Museum is VERY close to the big Vegas photo-op sign. The Pinball Museum is a decent sized arcade with TONS of functioning pinball machines that you can play. Lots of old school pinball and super old school video games.
TONS of videos on youtube for you for restaurants and stuff to do.
ETA: If you are from an area where recreational weed is not legal, be prepared to smell REALLY good weed out and about everywhere. It still kinda shocks me. I’m no prude at all, but it just kinda shocks me that it’s basically like smoking a cigarette outside now. You’ll just be walking (or even driving) and at any given moment you’ll get a SERIOUS cloud of STRONG, GOOD, DELICIOUS, STINKY weed. HIGH grade stuff. You’ll see - 