Diary of a wimpy kid: the last straw

Greg is writing in his journal (diary) again and is facing  more problems than ever before. He is getting into more trouble while trying to fix each of these problems. According to his dad, Greg should act more like his ex-neighbor, Lenwood Heath. His dad wants to send him to a summer conditioning program at Spag Union to change him from a troublemaker to a normal kid. Will Greg have to spend his entire summer at a conditioning program? Will he convince his dad to not send him to the program? What will be the last straw?