nothing structured here either, and my kids are very happy little monsters.
sometimes we'll do craft activities etc, but only whilst they're interested, i don't push anything onto them.
we spend a lot of time outside, i'm the mum who takes her kids out to see floods, play in the rain and mud, go walking through riverbeds etc. to me those things are the free, natural things that sparks their desire to learn more about the environment that we live in, but mostly just to have a $hiteload of fun, get dirty etc.
we read lots of books, sing lots of songs, and have heaps of fun.
sometimes i wonder if i should be doing more to extend their learning, but hey, you're a kid for such a short time, i want my kids to enjoy it.