Mason is one of those kids who does his best learning while ACTIVE. So we went on a nature walk at a local park and found "Nature's Treasures". If you look/think there are many different things to learn about in nature. Just a few we discussed on our walk were the obvious ones like colors (trees, leaves, flowers,etc...) But we we also talked about how you tell how old a tree is by counting its rings, how and why they fall, how their leaves turn color, their bark, why the ground gets muddy when it rains, how birds talk and make different sounds. You get the point. What helped us notice these things and get the conversation started was once we got to the middle of the woods we sat down on a log and I told Mason we had to sit and not talk so that the woods could talk to us.
....Try it and listen they have a lot to talk to your little ones about. Plus you gotta love the quiet time:)