Flint and Feather is an unmaintained trail beside the much more popular Grouse Grind. Unlike the Grind, however, it offers a nice view partway up the trail, is often devoid of other hikers, and even involves a little bit of scrambling (non-technical rock climbing). Definitely not for a beginner or anyone scared of heights.
Distance: 2.7km (one-way, gondola down)
Elevation gain: 810m
Time: allow 1.5 hours