How to do something new and "refresh" my mind?

Hello! I am new here in Berlin, but because of corona all I have been doing is a whole bunch of nothing (all by myself too). I feel like I have fried my poor brain here in my room with my laptop.
I am posting here just in case somebody has a really cool idea for me to try out :) anything from spending time in a cabin in the woods to volunteering somewhere. Unfortunately, it has to be more on the cheap side, as I am just a poor student. I seek a new experience or some "time off" like that, because I can feel that it is going to have such a good effect on me. Also, please no things such as "exercise" or "do yoga or "go for a run".