Convert a kiddie pool into a shallow pirate cove with cardboard treasure chests, spray cannons

https://erickjpum272.iamarrows.com/diy-splash-pad-budget-builder-s-guide-to-a-backyard-water-park

Convert a kiddie pool into a shallow pirate cove with cardboard treasure chests, spray cannons, and a map leading to a hidden “X” marked patch.