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The zen garden is peaceful, with several nice spots to sit. It is not a cultivated Japanese garden, but is is a lovely quiet space.
We took the trail out of the zen garden up Mt Zion. Overall it was well maintained, but had a couple of sketchy, barely-a-trail spots. Led to some lovely views.
Rather than turning back the way we came, we took the Alyssa trail back down. The map showed it going back just behind the parking lot, so it seemed like a good idea. If you consider yourself a technical, adventure hiker, or you like to climb, perhaps this would be a great trail for you. Going down was 85% scramble and rock face. It was terrifying. I went down most of it on my butt. It was not a good idea.
So if you're taking Alyssa trail from the parking lot, be aware that it's deceivingly pretty and easy for maybe a quarter mile. Once you hit that first rock scramble, it'll be mostly straight up.