William Heise is one of the hidden camping Gems in San Diego. It's located about 5 miles from the rustic town of Julian. There's over 100 camping spots ranging from RV to tent. There are a number of trails that leave from the campground. Try the Desert View trail that gives you a great view of the surrounding area; its only 2.25miles.  There's also a Wolf Sanctuary outside of Julian that's worth a visit. Enjoy!

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