Caillou spends his summer doing many new things. While the family is on vacation, they go to the beach and camping in the woods. The cold water takes some getting used to but once he's in, it's alot of fun. While camping he gets to sleep outside in the hammock with daddy and even sees a moose. Once back at home, the family goes to a theme park and rides the log ride and eats cotton candy. On a really hot day, he and Rosie run through the sprinkler, then watch real kids run through the sprinkler and play in the pool.