Las vegas family trip?

HI,
I am going to family trip to Las Vegas around end of April for two and a half day! (Friday night till Monday afternoon)
All of us are old enough to enjoy all the fun but since it’s a family trip I would like to go somewhere all of us can enjoy~~
I know there are tons of free show and events but it’s hard to tell which is the best!! I need some recommendation on
1) good events (prefer free but willing to pay for good show)
2) shops or places where I can get stuffs really cheap! (outlet, pawnshop)
3) good restaurant
4) some place I should avoid (dangerous, crazy…lol)

IF you know where to go to enjoy the Vegas….help me out~
THANKS