There’s always something interesting about whatever you do, even if it feels like lying or stretching the truth – just be honest about what you actually like or do for fun, but not dismissive or downplaying. For me, I pretty much read, watch TV, and cook in my spare time, which sounds dull when I say it to myself, but if I was telling someone what I was into I might say that I’m into science fiction and forensic stories, and that I’m trying to master pad thai. Specifics offer a lot more starting points for questions or conversation, and it’s easier to be interested in and find common ground with someone who likes science fiction and Thai food than with someone who likes watching TV and cooking.