Make a Fairy House. Your kids can use a big box and markers to decorate a whimsical fairy house, or make believe if you live near any trees. Not required, but if your little ones really love this game, check out the adorable Fairy Garden Miniature Table and Chairs ($13) that can take the imagination to the next level.
Yard Tic-Tac-Toe. All you need are a couple sticks and some rocks to re-create the iconic game.
Capture the Flag. If you don't have an actual flag, a T-shirt works just fine — and a good game of capture the flag can last for hours.
Decorate a Birdhouse. This is a great way to bring the joy of arts and crafts outdoors. You can fully DIY a birdhouse with cardboard, or "cheat" with this Buildable DIY Birdhouse Kit ($20, originally $33), which comes with water-based paint and eco-friendly wooden boards.
Customize a Kite. Before taking your kite for a spin, why not make it special so you can spot it easily in the sky? This Kite Making Kit ($13) comes with three blank diamond kites and markers to get you started.
Gardening. There's nothing like making something from scratch. Your kids can try planting seeds from existing plants, or you can get some help with this National Geographic Gardening Kit ($20), which also comes with pots they can decorate.
Backyard Mini Golf. If you have a putter or even a sturdy stick, you can build your own mini-golf course at home. Use garden sticks to mark holes, or get official with the GoSports Pure Putt Challenge ($35).
Build an Obstacle Course. All you need are potato sacks, bean bags, three-legged race bands, eggs, spoons, and some medals to create an epic obstacle course. If our kids really love this idea and you want to make it more professional, the Goldge's Field Day Games Kit ($25) is a great next step.
Paint Stepping Stones. Your kids will love finding great painting stones, then decorating them with paint and googly eyes.