Fireworks usually start July4th and run thru August.
Don't think they run in April.
That's ok, the kids will be tired at the end of the day. Go back to your room and let them watch a Disney movie while you slam some beers. Go to bed early so you can get up early the next day.
At City Walk, they have some kiddie rides, and a square that shoots water in the air. Kids run thru it, getting wet, having a good time. I think they'll be worn out by the end of the day.