Getting outside in the dark for a wild hunt can be interesting. Even walking or sitting out in a familiar space such as your garden can reveal different visitors to the daytime.
The back of my garden has a path and behind ours is a mass of ivy and brambles. During the nighttime, this becomes alive with moths with this being a perfect combination for them.
Every so often we are lucky enough to get bats and hedgehogs visiting. The mere nearby by does offer evenings for bat watches. Bat conservation trust has a list of local groups for if you fancy getting out and seeing more. The Barn owl trust may be able to give you more information
For younger children, the National Trust has a nighttime adventure book. Many of the ideas are obvious but still a nice bunch of ideas. It’s about to be re-released in a new edition. I’m not sure if it has changed or just a new cover.