In addition to a visit to the glacier grotto on the summit, the TITLIS Cliff Walk is particularly worthwhile for adventurers. The suspension bridge at an altitude of over 3,000 meters spans between two peaks and offers 500 meters of deep views as well as 150 steps of thrills.
In good conditions, you can also do the panoramic hike up to Grassenblick on the secured glacier trail (only sure-footed hikers with good footwear).