Since Tom forgets everything, it's not surprising that he forgot all about the trip he's supposed to go on with class 5F. It's good that his family helps keep him on track (even, once in a while, his grumpy sister, Delia)! Luckily, there are loads of excellent things to do on the trip, like making rafts, eating snacks, and seeing some very weird creatures. That is, as long as Tom doesn't get stuck in a group with anyone who snores or worse (looking at you, Marcus Meldrew!).