If your kiddos aren't into fast or scary roller coasters, I'd recommend heading to Universal's Islands of Adventure. It has some great family-friendly attractions like Seuss Landing and The Wizarding World of Harry Potter.
The weekend after Presidents Day can get pretty crowded. If you're lookin' for a more manageable experience, I'd suggest goin' on a weekday during Presidents Day week. Plus, if ya can snag early access, it'll give ya a head start on beatin' the crowds. Good luck!