I have hiked here several times in both summer and winter. The trails, especially in the northeast portion (my favorite part) of the park, can be quite strenuous with lots of going up and down big hills. The many interwoven loops offer infinite possibilities for track/distance, but beware of unexpected trail closures which force you to reroute (leave extra time). Put a pack on and this is good preparation ground for any serious hiking adventure
Okay, for riders (bikes or horses) I'm sure this is a fabulous trail. For plain old hikers that want to get their distance on, this trail is a stinker. Most of the trails are shared with riders and I hated having to look down constantly to avoid stepping in huge piles of poo. Plus trails are not very wide in some areas and when it comes down to person versus horse it always ends up with person clinging to a tree so that horse(s) can pass. The only part I enjoyed was the pedestrian only hill trail. It was definitely a challenge, I just wish it was longer.
Mitch L. on Murphy-Hanrehan Park Loop
Great trail riding when the trail is dry. Lots of loops and switchbacks to keep the quads burning. Enjoy!