We were in Las Vegas for a trade show in March and Mamma Mia had just started playing at Mandalay Bay. Tickets are expensive ($93.50 ea), but not as expensive as other prices I'd seen when seeing where else it was playing across the country. It is a hoot. If you liked Abba music and even if you didn't particularly like it, the show is just plain fun! You can't help but leave the theater feeling good.
We also went to Fremont Street to see the overhead canopy light show. It is very tacky area by day, but when it gets dark, it's fun to see the light show.
Getting married . . . or renewing vows (as was our case) at one of the wedding chapels is more meaningful than one might imagine. We did this at a drive through chapel on our way back to our hotel after visiting Fremont St. We did it for fun, but the minister who did the "ceremony" had a very genuine way of presenting things. We went to The Little White Wedding Chapel.
Also don't miss the Bellagio water show. It runs every 15 minutes to 1/2 hr depending on the time of day. They do a show to one song per showing. It's really quite amazing. While there, go to the Bellagio ($25.00/pp) Buffet. EXCELLENT!
Also, check out the indoor malls at The Venetian and Caesars . . . (Toto, I have a feeling we're not in Kansas anymore!) They are amazing . . . not just the stores, but the theming. It can't beat Disney, but they sure do try.
Just for the record, we didn't even gamble, but there was plenty to do . . . but not in the morning! Late starting place.