A scavenger hunt is a fun way to make a celebration seem more special. Write a beginning clue to help your parents find the next clue. You can hide little gifts along the way, and then at the end, have a cake or a banner celebrating your parents' anniversary. Your parents have done so much for you, and their anniversary is a good day for them to relax a bit. Surprise them by making a fancy breakfast and serving it to them in bed, so they can enjoy some time together.  For instance, you could make French toast or try your hand at quiche Lorraine. For a simpler approach, make toast and heat up some frozen sausages. Add a few strawberries on the side. If you have a family who loves getting creative, try setting up a little paint night in your home. Buy or gather small canvasses, paint brushes, and paints. Cover a table in plastic or newspapers, set out some plastic cups with water, and use paper plates for palettes. Try painting some of your favorite family memories. Make fun picnic food, like sandwiches, potato salad, pasta salad, watermelon, and cookies. You could also make a fruit salad. Put some blankets down in the backyard, and include some pillows. Include a card or special memento for your parents. Your parents probably can't tell this story enough, so let them tell it again. They'll like talking about it, and it will help them remember why they fell in love in the first place, which is always good on an anniversary.

Summary:
Set up a scavenger hunt. Make breakfast in bed for your parents. Set up a paint night to create new memories. Plan a backyard picnic. Ask them to tell you about how they met.