We have a rule that we have at least one TV-computer-videogame-free night per week, and we do something like play Scrabble or Monopoly Deal or something.
We usually watch stuff together, and watch our own things when the other person is busy. But if DH or I really want to see something (like FIFA soccer atm, for DH) then the other person just does something else.
I usually go on FB or OB, do assignments, read, organise my things for the next day... there is no shortage of things for me though as I usually have assignments.
If I find myself at a loss I pour myself a nice glass of wine and have a long hot soak in the bath with a good book

Not that it's happened for a while!