When his father takes him to visit the Louisiana bayou, Buster sends postcards to his friends back home telling them about the Cajun language, learning to catch crabs, and keeping watch for a swamp monster.
When his father takes him to visit Boulder, Colorado, Buster sends postcards to his friends back home sharing what he is learning about the Rocky Mountains and rock climbing.
When his father takes him to visit Vermont, Buster sends postcards to his friends back home telling them what he is learning about maple syrup and the "mud season."