Just my stuff
While I note several responses have included family/friend activities, I limit my answer to things in which I indulge alone:
Reading, mostly-non fiction books and periodicals
Exercise - lately I average about 30 minutes a day of weight-lifting, swimming, cardio machines, and/or calisthenics
Movies and television, though much more of the former; except for
The Simpsons, and I'm not regular viewer of any T.V. programs, though I listen to webcasts of
Bill Moyers' Journal and
Democracy Now! while working out and cleaning
Music, mostly pop and rock but also some funk, rap, and country
Radio, including WBAI-FM, New York City; Thom Hartmann, whom I only get to hear on
You Tube clips these days; and New York Yankees baseball, because I like announcer John Sterling (I am not a fan of the Yanks, or any one team)
Writing, mostly contributing to print and on-line forums of some of the above