One Year Anniversary gift!

So my one year anniversary is coming up with my wonderful boyfriend! We've known each other for about 4 years now, and I'd love to do something very special for this occasion. I don't want it to cost much though because it's only our first year together officially. So I've seen people do this thing where they ask people around the world to write on a piece of paper where they are and say my love for you is so big it reached (whatever location).