Found the following from the exact text from the Stay at Home Order on
covid19.ca.gov (pasted directly):
Outdoor recreation
Can I still exercise? Take my kids to the park for fresh air? Take a walk around the block?
Yes. So long as you are maintaining a safe social distance of six feet from people who aren’t part of your household, it is ok to go outside for exercise, a walk or fresh air. Gyms are closed.
and
Can people still go hiking or visit State Parks?
Californians can walk, run, hike and bike in their local neighborhoods as long as they continue to practice social distancing of 6 feet. This means avoiding crowded trails & parking lots.