I've hiked in this area a bunch of times and have always wanted to climb Markham. I expected the trail to be hard to follow in the final approach, but it was pretty easy to follow. That said, the final approach is very steep in parts and there's a lot of poodle brush and yucca. I would not recommend doing it in shorts. The views at the top are quite impressive and are different from what you see on nearby peaks. You could easily combine this hike with a trip to Mt. Lowe or San Gabriel Peak if you're looking to extend the outing.