He helps Grandma with her garden, gets the measles, puts on a finger puppet show and collects rocks.
A Sweet and Sour Day - Caillou is helping Grandma water her flowers and fill the birdbath. When they get thirsty and need a break from gardening, Grandma finds there's no juice to be found in the fridge. No matter, Grandma shows Caillou how to make fruit juice from scratch, and it tastes so good that Mommy asks for seconds. Caillou's Puppet Show - Caillou and his friends Jason and Jeffrey make finger puppets at playschool and decide to put on a puppet show for the rest of the class the next day. The next morning, however, Caillou is disappointed to find that he's caught the measles from Rosie and can't go to playschool. All is saved when the whole class comes to wish him well and the puppet show goes on as planned - through the living room window! Caillou's Collection - In the park Caillou starts a new hobby - collecting rocks! He finds out that Grandpa has a rock collection too, and they go to the quarry where Caillou watches a worker break up big stones into smaller ones. Caillou gets to pick out a rock for Grandpa that ends up in Grandpa's new rock garden. Which gives Caillou an idea for the perfect spot to put his own rocks.