Whether your kids are all young or they’re grown up with their own little ones, these activities will bring you all a little closer together—the happy memories of time together and hours of entertainment are just a bonus. For planners and last-minute-activity-searches alike, here are 12 unforgettable family activities to do with your brood before they fly the coop for good. When choosing an activity, take a cue from the things that your kid loves. If he’s obsessed with dogs, he’ll enjoy rounding up supplies for the animal shelter; a nature nut will dig a trail cleanup. What’s age-appropriate? Kathy Saulitis of generationOn, a New York City–based nonprofit foundation that partners with youth service groups, has a few suggestions: Young children might visit a nursing home or make cards for people in hospitals, while older kids can collect food for a food bank or organize a car wash to raise money for a cause. “When it’s unearthed, if ever, it’s usually a soggy mess,” says Paul Stephen Hudson, a cofounder of the Atlanta-based International Time Capsule Society. Pile everything into an archival box, then stow it away in a cool, dark place. Include the big stuff (artwork, school reports, notes to your future selves) and the little (movie stubs, a printout of a memorable Instagram post, a toy with its batteries removed so they don’t corrode). Items that won’t stand the test of time: delicate clothing, food, or tapes and discs that will be outdated by technology. Add a silica-gel pack (which comes with new shoes) to absorb moisture, and set a date for the big reveal in 25 years. Once the sun sets, keep them entertained with good old shadow puppets. And don’t forget to brush up on ghost stories for around the campfire (er, flashlight). Spark their imagination with things that are open for interpretation, like “something that smells really bad” or “an object that starts with the letter K.” (This also keeps the kids from clobbering one another while racing to the one blue spatula.) When time is up, tally who found the most items. Aside from bragging rights, the winner gets a fun prize, such as a gift certificate to the movies or the ice cream shop.