Greg Heffley and his family are getting out of town. With the cold weather setting in and the stress of the Christmas holiday approaching, the Heffleys decide to escape to a tropical island resort for some much-needed rest and relaxation. A few days in paradise should do wonders for Greg and his frazzled family. But the Heffleys soon discover that paradise isn't everything it's cracked up to be. Sun-poisoning, stomach troubles and venomous creatures all threaten to ruin the family's vacation. Can their trip be saved, or will this island getaway end in disaster?