If you stay at Wynn, with a 5 yrs old, you probably cannot walk to Strip.
Caesar Palace has a show deep inside its shopping arcade, called Atlantis - lasted for about 30min in total - with Fire and Ice and Supersize Man and Woman coming out from underground...
Around the Atlantis stage there is a big size floor to ceiling semi-circle Acquirium with lots of tropical fishes - kids should love it. We adults loved that too.
Flamingo actually has a garden with rare water fowls including, of course, flamingos. Very nice setting like a botanical garden and mini zoo combined.
Chinatown has plenty of good restaurants, but you need to have a car to get there.
Parking on Strip is free - every hotel has multi-levels garage.