DON’T GO TO SIX FLAGS AND THE BRONX ZOO!!! Are you crazy? It’s gonna be swamped.
Try Bear Mountain (paddleboating is really, really fun) or go to the Catskills and do all that stuff you don’t get to do in the summer. My whole extended family used to go every year to this one trail (Kaaterskill Falls, near Tannersville) and hike it. It was SOOO fun.
One year we went all the way to Lake George on chol hamoed for two days and we brought all our own food (though they have an awesome supermarket in Albany). Much less crowded there.