Treasure Island now "TI" did away with the pirate show.
Circus Circus still smells like old sweat, lordy, implode the dump..
If I was bringing kids, I would stay at Mandalay Bay and use their wave machine pool (May will be hot) and visit their aquarium experience.
There are plenty of bowling alleys.
REALLY not a kiddie town, that experiment died years ago.
Many casinos have arcades good for an hour or two.
Movie theaters are fairly plentiful.
Shopping at the South outlet mall with mom might kill some time.
NY NY coaster ride. Rain Forest cafe at MGM grand is kind of cool for kids.