Jimmy and Mabel Smith and their infant daughter Bubbles are visiting San Francisco. After getting off the boat, their first stop is a Chinatown restaurant, where they and by association their fellow restaurant customers get into a few misadventures with the noodle dishes. The next stop is the horse show, where they get into more hijinx, first because of their dog Cap who is the size of a horse. But the biggest trouble may be specifically for Jimmy, as he wants to indulge Bubbles by buying her a pony, and doesn't want her or Mabel to know about it until they get back to Los Angeles. Overhearing Jimmy's conversation with the pony dealer, the beautiful Lillian Saunders, about the purchase, Mabel mistakenly believes that Jimmy is planning on running off with Lillian. That belief makes getting the pony home on the ship all that much more difficult for Jimmy.