Masca Gorge is the classic mountain excursion from Los Gigantes, a deep ravine cutting through the Teno massif north of the resort. The village of Masca sits above it on a road that twists through some of Tenerife's most dramatic scenery.
The gorge hike has access rules and closures that change, so check locally before assuming you can walk all the way down to the sea. Even without the full hike, the drive and viewpoints make a superb half-day from Los Gigantes.