Not a dang thing. Have cards and small goodies for the immediate family, but that's it. Prob just spend part of the day getting some work done on a project since I at least lucked out in having the day off. Old enough I've pretty much just decided not to care all that much about it anymore if I have to spend it alone. (Okay so I'm a dork that was considering spending the evening with a TMNT movie or two.
If you don't have a real life human date they're not a bad bunch of guys to spend the evening with instead.)