Book and Pay For 4 Nights and Get the 5th Free Sunnys Adelaide Backpackers Hostel. Book and pay for 4 nights and get the 5th free, including free Wi Fi, daily pancake breakfast. Welcome to Sunnys, the smallest and friendliest hostel in Adelaide. Sunnys has been serving the international traveler since 1986 and has earned a reputation for providing a caring and safe home away from home while you explore our city and surrounding attractions. As one guest so well said, iIs like staying at a mates place.