JoJo and Gran Gran are on a day trip to the sunny seaside with one mission in mind: to build the biggest sandcastle ever built so that Panda can play inside. But JoJo has no luck with building her sandcastle and feels disheartened when she learns about the tide and how it will carry her best sandcastle yet away into the sea! But with Gran Gran on hand, JoJo learns that things don't need to last forever to be special as the pair take lots of pictures for them to keep forever and remember.