Little Theo loves her Poppa and is in awe of his trunk of maps, pictures, postcards, and other mementos from his days as an explorer. As Poppa's birthday approaches, Theo decides the perfect gift is an adventure that she and Poppa can go on together! She creates a map for them to follow, and then Theo and Poppa go to the beach where they stroll in the sand, collect stones, grab some gazpacho, and return with new things to put in the trunk.