Homosporous ferns produce sporophytes by intra gametophytic selfing, inter gametophytic mating, or apogamy.Gametangium ontogeny, genetic load, and ploidy affect the mating system of each species.
This doesn't involve people fighting people, but people fighting giant salvinia, a fern from Brazil that's causing a lot of problems in other parts of the world.
I mean, you just need to go out and look, and there's so many possibilities to have fun: making tree houses, making dens out of the woodland ferns and things like that, going on searches for frogs.