A not-so-secret coastal gem can be found nestled in a remote corner of the Royal National Park, 50 kilometres south of Sydney. To get there, you have to walk along a 2.5 kilometre trail from Garawarra Farm car park, navigating a well-worn path at the foothills of Stockyard Gully. Winding your way through sand and shrub, the hike can feel endless at the peak of summer, but the view promises to be worth the wait. At the end of the path is Era. And for almost a century, it has been an almost private oasis to a passionate group of…