Museums are fun. Going to a park. Doing something active (riding a bike/going for a walk). Going to the theatre/opera/play. Festivals are great. My kids and I love to participate in fundraiser type events (walks, parties, etc). Volunteering at a charity is fun and helps with gratitude.
I personally like to do things that expand my mind, soul, and spirit
Enjoy the night on the town! I hope you find something that you both enjoy!