people walking on boardwalk, wittdun dunes, amrum island, north frisia, schleswig-holstein, germany

active activity amrum amrumer boardwalk dune area dunes elderly europe european fit footpath frisian island german germany hikers hiking kniepsand landscape leisure nature nordfriesland north friesland frisia sea outdoor panorama people recreation schleswigholstein senior seniors tourism tourists trail vacation walkers walking wittdun