I like this idea, maybe could use more shallow water tubs thought. A big rive-like pool for water play. Kids can crowd around both sides of the pool. Also can learn how things travel from one end to the other
Use an old tire to create a small backyard pond. My kids, 3 sons, have been helping with yard work and planting. They keep asking for a pond. I think this is a great DIY project to do outside with them. Looks simple.