Beautiful and well-marked trail with amazing views of Zugspitze and the Alps. It's a steep climb, but not too difficult. The trail is popular with locals and quite busy, but definitely not overrun like the trails on the opposite side of the valley. Along the way are a bunch of alpine cabins & farms offering Bavarian food.
Another plus is that this trail is easily accessible by public transport, e.g. from Munich. Just take the train to Garmisch-Partenkirchen (approx. 1h) and walk from the train station to the trail head.