Other than the obvious 
Summer evenings if we're not too tired after work we'll often go out for a walk / to the beach / cycling. I always feel sad when it gets too dark in the evenings for that to be fun, it'd be really nice to find some winter-time equivalent.
We both go out to (separate) activities one evening in the week, & at weekends we'll often go to the pub with friends / out to a gig or something, so really looking for inspiration for activities that are home based / not costing money.
Our TV tastes don't really overlap, so that's not a great option as we tend to run out of things to watch.