S.Q.
I don't know if this is up their alley, but my friends and I love board games. For a couple of friends, I made a tower of really lovely wooden board games like chess, mancala, Quarto and others. Also, Scattagories, Trivial Pursuit, cribbage and things like that. Twister, too, just to be silly. I wrapped each separately and stacked them in a tower. I think I spent about $120 each time. Then, when we come over to their house, there are always fun games to play! But, if they don't like that kind of entertainment, it wouldn't work.
In that case, a pair of tickets to a play or concert is awesome, too. Someone gave us two tickets to Steppenwolf theatre in a cute frame. That was a nice change of pace! If they have kids, you could offer to babysit that night as a special prize!