This is a pretty good hike.
I think most reviews cover the summit trail, but I'd actually suggest hiking the circumference trail instead. You still get some excellent city views and I would say the challenge is comparable since it's twice as long and you have two saddles to climb. But more importantly, the circumference trail is less crowded and the trail surface is in so much better shape (except where it overlaps the summit trail). The traffic on the summit trail is so heavy that there's hardly a scratch of soft dirt left on it.
For those with vehicles that have low ground clearance, I would suggest finding a friend to ride with or turning around and going elsewhere if you can't get a spot in the first parking lot. It doesn't matter how slow I go or what angle I approach, my car won't clear some of the speed bumps on the park road.