To be honest, I can't say that I have a definite hobby or that I have a regular go-to activity. I usually just do what I want to do at the moment. There are even times when I just bum out in my room doing nothing. To add to that, I can also be easily influenced by other people. For instance, when people ask me to go out, they need not have to ask twice.
I guess it totally depends on my mood, and the activities available for me to be able to pass the time. If anything else, I do love browsing the internet, playing online games, reading (occasionally), talking with friends, watching movies or series, and of course, sleeping.