A little boy imagines all the things he will be able to open once he gets bigger, but for now he needs his parents' help.

Nat's class trip is a bigger adventure than she imagined! Nat is on an overnight class trip to Philadelphia, which is her first time in a big city without her parents. And it's a big deal because Nat's mom and dad are finally giving her the independence she's been longing for. But the trip is off to a bad start--with one disaster after another--and if things keep up, Nat's on track to lose her newfound freedom for good! Can she turn things around...