A friend organized a hike starting from Chantry Flats up to the Mt Wilson Toll Road. I actually have never hiked from Chantry Flats, and was pleasantly surprised by the steepness. Basically gained the ridge and didn't stop for 3000 ft gain. Avoided all fire roads on the way up, with some really steep and unstable terrain!

Then, when we got to the toll road, we were gonna wait for the 2nd group to get up there, so I decided to see if I could get up to Mt Yale and some followed. I found some footprints along the east face and continued up to find some faint semblance of trail, though the brush started getting thicker.
We dropped our bags and continued ahead, running into annoying brush but nothing that couldn't be passed. There was one difficult spot where we had to crawl under some manzanita trees (or bushes, I don't know what they're called), which led us immediately to a use trail that we could take to the south. A little more brush long the way, but pretty easily led to Mt Yale.
There are some nice rocks and views from this peak, so I was quite happy to make the side trip. Log book shows not many people visiting it, which is quite rare with a peak around so many popular trails.
On the way back, took the Winter Creek trail which afforded nice shade and a pleasant stroll.