Getting outside and experiencing nature is good for the mind.
Explore the UCLA Mathias Botanical Gardens.
If you are interested in growing your own food, or just want to spend an hour gardening to relax, check out Dig UCLA Gardening.
Have you always wanted to camp at Joshua Tree, or backpack through Yosemite? UCLA Outdoor Adventures can take an adventure.
Check out E3's page for gardening mentorship opportunities with local schools.
The Murphy Scuplture Garden at UCLA offers a respite from the hustle of everyday life.