Definitely reading and baths!
I love reading, fiction, non-fiction, current events, heck, even spending a stupid amount of time on Wikipedia and Quora is not unusual for me these days.. It means I'm really good at walking around staring at my phone and not accidentally stepping into traffic, although I did trip over a fire hydrant once.. that was embarrassing. I just recently picked up the autobiography of the founder of Nike and his early experiences vis-a-vis doing business with the Japanese. Quite interesting.
I also really love baths and strong jacuzzi jets. Luckily the Japanese share this love so whenever I pick hotels in Japan I usually try to find ones that accommodate this.. Which is much more rare in North America and Europe, unfortunately.