Or you can buy a bunch of them, bury them in your yard, at a park, or at the beach, and play "pirate treasure hunt" with the kids. This happens a lot, and "the kids not finding the coins" must happen a lot too, because we often get detectorists coming onto the forum saying "I found one of these at a beach".
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis