sports and recreation trails around the swiss katzenseen lakes or promenade along lake katzensee (katzen lake)

switzerland destination recreation katzenseen regensdorf wilderness promenade katzensee landscape adventure beautiful undefined mountain vacation trekking backpack outdoors activity peaceful zuerich schweiz sunrise natural tourism tourist outdoor scenery sports trails katzen canton zurich travel nature forest autumn europe hiking alpine valley county summit scenic swiss lakes zrich water grass sport green trees rural sunny lake tree blue