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Anytime I talked to admission counselors, they always say volunteer in what you enjoy. I would definitely put down that you volunteer at a arboretum since that's really unique and will set you apart. Try to have some hours with human interaction so they know you can communicate with people lol
 
I had hundreds of hours of volunteer time at a community garden. It was a talking point in 3 out of 5 of my interviews. Anything to separate you from the pack is good as long as you have the GPA/DAT to back it up.