Noticing that it is summer time, USA Today decided to scour the high channel numbers of its cable system to find “hidden gems” that can be watched while viewers are down the shore. Among the finds: Planet Green, “Unbeatable Banzuke, Ninja Warrior” from G4, “Sordid Lives: The Series” on Logo, “Top Gear” on BBC America, “Diners, Drive-ins and Dives” on Food Network, “The Works” on History, “From Gs to Gents” on MTV and “Reality Bites Back” on Comedy Central.