Dog Pond - Place a plastic kiddie pool in the ground. It'd be easy to clean and looks nicer than having it above ground. Big dogs can't chew it up or drag it around. This is obviously more fancy than a plastic kiddie pool underground, good idea thou
Dream backyard for kiddos: Nearly buried trampoline, small wading pool and playground. Playground area and pool subject to pool upgrade or conversion to garden / water feature / backyard chill pad as the kids go tweens!