The place I go for breaks is a small garden behind the library at my university in Wuhan, where I'm doing a master's degree in chemistry. It's not an official rest area, so most students don't even know it exists.
It's a narrow strip of land between the library and an old laboratory building. Someone, probably a gardener years ago, planted bamboo along one side and a couple of osmanthus trees, which smell amazing in autumn. There's one stone bench and a little pond with a few goldfish, and the walls on both sides keep out most of the noise from the campus.
I go there two or three times a day. Usually there's a short break in the middle of the morning after I've set up an experiment, and a longer one after lunch. If an experiment fails, which happens quite a lot in research, I'll go there to calm down before I start again.
What I like about it is that it's a complete change of environment. The lab is bright, white, and full of the sound of machines, and you always have to be careful and precise. In the garden there's nothing to measure and nobody to report to. I usually leave my phone in my bag and just sit, watch the fish and listen to the bamboo moving. Even ten minutes there clears my head, and I often solve problems that I was stuck on in the lab. My supervisor actually told me about it in my first week. He said it was where he went when he was a student, which makes it feel even more special.