17. Book nights
This is essentially for couples who love to read. You can make a book club for two. Decide on a book to read; give each other a deadline and then fix a night to review and discuss. Just be careful to stay on the same page, or different view points on a book could lead to a long night of arguments.
18. Cocktail night
Instead of drinking beer, whisky, or rum, spice things up with some mean cocktails. Search for recipes on the net and get to business. Try making mojitos, shandies, LIIT, whiskey sour, or Bloody Marys. You can even create your own cocktails. Get drunk and have a good time.