The only way to make it "just right" is to offer and not coerce. If you don't "offer" stuff/ideas/experiences, then the kids aren't going to even know what's out there. If you push too much on them, they can feel pressured and that their learning is being taken over by you.
It isn't all that tricky, though, when you live with a kid and pay attention and care deeply—to keep that child in mind and provide him/her with a pretty steady stream of options/possibilities/ideas/ stuff, etc. Invite and offer a lot—it is your job to create a stimulating and interesting environment around her.
photo by Sandra Dodd