For a really local hike, its great! The Holmes Run part is very average. Paved bike path, views of the stream but somewhat dirty. Passing under 395 is a little creepy as some folks were hanging around the long underpass during the day when i went. Once you hit the Dora Kelly Nature Preserve, it is decidedly moderate! If you stay on the hiking trail there is quite a bit of hill climbing and some switchbacks. The trail pops out of the forest and then joins back up with the bike trail that climbs even more. It's quite lovely. Made the slightly icky Holmes run section very worth it!
Don O. on Holmes Run Trail
First time on the trail and enjoyed it very much. I work nearby and it is wonderful to be able to escape the urban area for some peace.