Transit, by Edmund Cooper
An unchallenging novel about a frustrated painter who finds himself abducted by aliens, subjected to a few psychometric tests and dumped on a desert island with three other humans and four golden haired superbeing types.
Much jaw chewing and machismo ensues, including pumping bullets into the skull of a pygmy rhino with six legs, miscarriages, skirmishes with ray guns and bows and arrows and a pornography covered beach.
It's not a book to set the literary world alight, but for a nice bit of simple escapism, this is the one to read.