Relaxation ideas for a college student please read.?

Relaxation ideas for a college student please read.?
colors: green
area: as big as possible
plants: poppy, coco, cannabis, mushrooms
Im doing a project for my ecology class. We are building a garden on our campus. My groups garden idea is a relaxation garden. A place for students to go and just relax in between classes and on breaks. I need to know what sounds are soothing to most people, what colors, how big of a area i should use. Also what plants help calm people. All references are welcomed, but i would love personal ideas most. I really want this to not only reflect on students but on everyone. Thank you soo much!

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