This will sound like typical Mediterranean/Balcans young person's answer, but I love spending time in caffés and pubs with my friends.
There is probably little in this world [aside reading :lol:] which I thoroughly enjoy to that extent - coming to caffé, always meeting somebody there, sitting with them whilst staring at their faces through the clouds of smoke around us, ordering a cup of tea (tea drinker amongst coffee addicts :)), chatting, waiting for somebody to pull out cards, then playing cards; waiting for somebody to come with guitar, often the waitor himself if there are not many people in the pub, reading there, discussing just about everything - from world politics to literature - and meeting many new interesting people. It has become nearly a routine, before or after (or during :lol:) school going to caffé or pub, and hanging there. Sometimes even doing nothing, each lost in their drink and cigarette, contemplating life. I love it.
I usually combine it with going to library.
Another of my hobbies is walking. Instead of using public transport, I often walk wherever I need to go and let my thoughts settle down whilst I walk.
I also enjoy yoga (which is, since I stopped dancing when I was 14, about the only physical activity I have got in my life).
And there is, of course, reading, needless to mention. :) Reading, spending time in library and second-hand bookshops, everything of the kind.

