Go to the park and fly a kite, blow bubbles and have a water gun fight.
Play a board game, card game, video game.
Go to a store and challenge each other to find a really sweet/creative/romantic gift for $10 or $20.
Go to a dive bar and play darts or pool
Go to different spots in your city and have strangers take your picture. Make a photo album or scrapbook of the day.
Dress up, cook dinner or take out, and have “restaurant night” at home!
Check your local paper or its website for upcoming free concerts. For shows in the park, pack a picnic basket and blanket so you can dance and dine in the same place.
Make a book of the highlights of your life together. Paste in pictures, starting with your wedding day, followed by trips, holidays, and moving into your first house. Fill it in with candids and cute quotes. Leave blank pages in the back so you can load up with new memories next year.
If you have another couple over, you can graduate to Rock Band and get your ya-yas out like The Stones.
Doing good together can be a lot of fun. If you love the outdoors, find an organization that plants trees or cleans beaches.