My DS1 and DS2 are staying with my parents at the moment (it's half-term) so today instead of taking DS3 to nursery, DH and I walked over to Clissold Park.
DS3 wouldn't get out of the buggy at first, but when we got near the ponds and he saw the swans and ducks, he got out, ran round the ponds and looked at the birds and paddled in the puddles and really enjoyed himself. He was very good about walking with us, and coming back when I called to him (which is new, and most welcome!).
It was great, but it does make me realise that I spend a lot of time with him thinking about how best to "manage" him and trying to do "learning activities" with him - and not enough just enjoying him.