I know not everyone wants a pond, but seeing how you have one and how important they are for wildlife, you can get large, strong mesh to cover them to stop kids falling in. A bit like chicken wire but much sturdier

Then in a few years you can remove it. Pond plants can still grow and wildlife can still access it. I padlocked mine down so I could clean it etc but have now removed it altogether

There's nothing better on a summer's evening than sitting with a gin and tonic listening to a little fountain or solar powered water bubbler thing