Tickets are pretty inexpensive.
My boy and I would get two tickets and just roll between the Thomas & Mack and the Cox Pavillion all day.

Try to go on a day when the Lakers are playing.
Those fans from LA come through and it's a good environment.

Try hitting up Downtown Vegas.
Definitely better for families.
Check out the Downtown Container Park on Fremont St.
It has a large robotic preying mantis outside that shoots fire.
Very kid friendly, but interesting enough for adults.