We go to gigs, comedy clubs, to the theatre. Sometimes to the cinema. Out to dinner. When it's warm and fine weather we go for evening/moonlight walks in the woods nearby. Very occasionally just to the pub though that never feels like a date to me. Just a more expensive, less comfortable place to have a glass of wine than our sofa. 
When DC were small we never just went to the pub or for dinner as we would just end up talking about them, so we got into the habit of going to a gig, show or comedy night so we'd have something to talk about except DC! Now they are older, we go out to dinner more often as we are making plans for when they have left home.
We manage date nights about once a month. More often we used to use babysitters because we were having dinner with friends or going to a party or quiz night.