I went there about a year ago with wife and kids.
I like it, but it is expensive.
We liked, and kids liked:
- Tournament of Champions jousting/dinner thing
- Cirque du Soleil's Ka
- Secret Pizza
- Omega Mart (LOVED Omega Mart)
- Seeing the inside of the Venetian
- Omelet House 50's diner
- Show inside the Sphere (is surprisingly expensive, like $100+ per ticket)
Also went to see Hoover Dam, which was awesome. Included eating at cool diner place Coffee Cup Cafe in Boulder City, which is a cool little town on the way, like a step back in time.