Greg Heffley and his family hit the road for a cross-country camping trip, ready for the adventure of a lifetime. But things take an unexpected turn, and they find themselves stranded at an RV park that's not exactly a summertime paradise. When the skies open up and the water starts to rise, the Heffleys wonder if they can save their vacation - or if they're already in too deep.8+ The One with the camping trip disaster!