On a hot summer day, D.W. and her preschool class go on a field trip to the aquarium. When a shark swims by, her classmates hide while she teases it, but when an octopus appears, she is the only one afraid. The Reads go to Bear Lake to escape from the summer heat and everyone is having a wonderful time, except for D.W. who won't swim because she thinks there are octopuses there.