Alice Yoo / BuzzFeed 1. Turn a box into a skee ball ramp. frugalfun4boys.com See how to set it up here. 2. Blend crackers in a food processor for a mini-sandbox that's baby-friendly. happilyevermom.com Genius, right? Get the tutorial here. 3. Grab a couple of fly swatters from the dollar store for a game of balloon tennis. littlebinsforlittlehands.com See it on Little Bins for Little Hands. 4. Create a scavenger hunt that requires literally no effort. iheartcraftythings.com Learn how to turn a paper bag into a scavenger hunt on I Heart Crafty Things. 5. Turn watercolor palettes and water balloons into target practice. brit.co See more backyard activities on Brit.Co. 6. String up cups for a little playful competition. allfortheboys.com Learn how to make this squirt gun cup race here. 7. Take "Go Fish" up a knotch. handmadecharlotte.com Learn how to make this fishing game out of cups, pipe cleaner, wire, and a bamboo stick here. 8. Dye shaving cream for the messiest, most colorful, most fun game of Twister ever. goldenstatemom.com Cleanup is easy if everyone is in their swimsuits: just rinse them down with a hose after the game is done! Learn how to do it here. 9. Turn a shoebox into a marble roll. onecraftyplace.com Learn how to make it on One Crafty Place. 10. Glue toilet paper rolls to a box for a quiet maze game. creativeconnectionsforkids.com This game will also help them improve their hand-eye coordination. See it here. 11. Tape down a landing strip for their paper airplanes. meaningfulmama.com See it on Meaningful Mama. 12. Hide Legos around the house for a game that will keep them busy for hours. whatmomslove.com Check out more ideas on What Moms Love. 13. Turn UNO into a movement game. stillplayingschool.com Assign movements to a few different cards to burn off some energy and test their memory. Learn more on Still Playing School. 14. Wrangle up 12 buckets for a game of bucket ball. momtastic.com Kind of like beer pong except kid-friendly. Get the instructions from Momtastic. 15. Pass a balloon around with questions written on it to help two new friends get to know each other. kikicomin.com Whoever catches the balloon has to answer the question closest to their left thumb. See more rules on Kiki & Company. 16. Draw a grid to reboot an old classic: Four Square! education.com Get the rules here. 17. Play connect the dots with toothpicks. sayyes.com Learn how to set it up here. 18. Make a ring toss out of plastic bottles. Miki Duisterhoff / Via womansday.com See the setup here. 19. Make a giant dice out of a box and set up a human board game. trueaimeducation.com Get the rules here. 20. Set up an obstacle course with whatever you have. imaginationsoup.net Jump ropes, hula hoops, chalk, ladders, and pool noodles are all fair game. Get ideas here.