Apr 16, 2021 - 1:25 AM
I would recommend the route I took - take the train to Riffelberg then hike up to Riffelsee - Rotenboden - Gornergrat.
Not very tough except for the ascent up to Gornergrat, I remember starting the hike around 9+ in the morning and finished it with a nice warming lunch in an bistro at the Gornergrat station.
If it's a clear day, the view at Riffelsee and Gornergrat can blow minds for sure.
Also if you have more time in Zermatt, the hike from Schwarzsee - Trockener Steg (route 26 on the map shared by IIdiko) also gives special view of the Matterhorn and some of its geological history. It is slightly more challenging than Riffelberg - Gornergrat route in my opinion though.