Yachtsman Steve Drexel bets his friends that he can swim ashore on a remote south-seas island with nothing but a toothbrush and be 'living the life of Riley' when they return. With handmade implements the lighthearted, athletic Steve improbably builds a comfortable home with all amenities...and local fauna trained to help him! Meanwhile, a grass-skirted young lady flees an unwelcome wedding on a nearby island. Steve calls her Saturday, but what is he to do with her?
