Snoopy and the rest of the ''Peanuts'' gang go to the beach for the day. Once there, Snoopy promises to go back to the beach the next day to meet up with Peppermint Patty. After Charlie Brown has gone home to play ''Monopoly (game)'' with the others, he notices Snoopy is late and remarks he is tired of Snoopy being late. The next day, Snoopy is thrown off the beach due to a new "No Dogs Allowed on this beach" rule (thus setting a running gag in the film). Then Snoopy gets thrown out of a library due to his disruptive behavior and another "No Dogs Allowed in library" rule. He then gets into a fight with Linus van Pelt over his blanket, and later beats Lucy van Pelt in a boxing match.