I think you should do whatever you feel like, whether that's writing code or studying computer science at the weekend, or watching movies or going out in nature

I think you should do whatever you feel like, whether that's writing code or studying computer science at the weekend, or watching movies or going out in nature (try learning to identify birds!). But if there are other people that you spend your life with at the weekend, then there's obviously a pretty good argument for doing something you'll enjoy doing together. (And obviously if there are not other people you spend your life with at the weekend, then there's probably an argument for addressing that at the cost of some time doing computer sciencey things.)