Make a paper boat. (There are a lot of good tutorials online, including videos.) Write a wish or vow upon it and release it into a river, stream or ocean. You may also include prayer requests and blessings for others, though it’s best for each person to have their own boat. Also make sure everything you’re putting in the body of water is non-toxic and biodegradable.
If you have a group you can race boats, with the winner getting extra charis or grace.