Been a few times.
I'd recommend Fremont Street for a fairly surreal experience away from the strip.
Also recommend a Golden Knights game if you can get to one at T Mobile Arena.
Also check how far everything is as it looks a short hop and across the road but usually takes a lot longer and a lot more walking to get to.
I'd also book some of the swankier places to eat before you go but I enjoyed the smaller places just as much. Rock's Rolling Smoke Barbecue was very good as was Tacos El Gordo.