Brewster Glacier is a must-do hike in New Zealand's South Island, offering stunning views of Mt. Brewster and the surrounding alpine landscape. The trail starts at Fantail Falls Car Park, near Makarora, and leads to Brewster Hut before continuing on to Brewster Glacier and Mt Armstrong. The hike is challenging but rewarding, with steep sections, rock scrambling, and breathtaking scenery along the way.