Hiking the Stonewall Peak Trail to the summit is one of my favorite hikes. At the top you'll find a stone lookout with 360 views of the surrounding peaks. It's one of the more unique summits out there and worth a visit.
Google Maps trailhead:
Paso Picacho Campground, Julian, CA, 92036, USA
If you have GPS device (I use this one by Garmin and I love it) for your hike, load the GPX file below into your device to navigate the hike. For help on loading the GPX file, read this article on converting and transferring to a Garmin GPS.
Also, don't rely on electronics as your sole means of navigation. There's a basic printable PDF map below, and I strongly picking up a good topo map too.
Note: if you want to end your hike here, you can simply go back down the way you came. This route takes you back to the start of the hike on a route with less crowds.
A quick note. These directions are meant as a guide for the hike, and not a definitive source. Conditions change, and the information here can be different based on time of day, weather, season, etc. There can be small side trails that you might see but I missed. I have made every effort to include all the information you need to complete the hike successfully. I recommend using this guide in conjunction with a map, GPX file, common sense, and call to the ranger station or park office. If you do the hike and notice something has changed, please contact me and I will update the guide.