The Gertrude Saddle Route in Fiordland National Park is a challenging tramping track that should only be attempted by experienced hikers in good weather. The 7 km return route includes steep climbs, rocky terrain, and river crossings, so it's not for the faint-hearted. With breathtaking views of the valley and Milford Sound, this alpine adventure requires proper gear, navigation skills, and caution, especially in wet or icy conditions.