One year I got my in-laws to watch the kids for a couple of days. We got in the car and just drove until we felt like stopping. Found some quiet little local spot to eat then pressed on. Wound up in a small hotel room spending "quality time" together. Wink wink. And slept in the next day before meandering back home. It was simple, it was relatively cheap, and it was nice to just hang out with my best friend.