Take a road trip. Gas isn’t the cheapest but it’s cheaper than airfare. Gas up the car or truck and take a quick weekend trip close by just to get away.
Cook a meal together. Instead of going out every week to eat, stay home and cook a meal together. This is a great way to learn each other’s eating habits, food likes and dislikes or exactly who has the better skills in the kitchen.
Visit a museum. There are surprisingly quite a few museums that offer free admission. Take in some culture and maybe even learn a few things together that you didn’t learn in college.