Nature in our area has so many things to offer and I think it truly is necessary to teach our kids about it, show them around, allow them to experience and learn to apprechiate what we have. 
We were invited to accompany a small group of boys from our area being cave explorers for one day. There are many lava caves around, most of them difficult to find and the exact place only known by members of the local rescue teams (they use to train there) and a few others. In some caves are lava dripstones, which by any means are not to be broken or taken.
The group was quite excited and had great fun exploring the dark veins under the surface. When they plunged down, you never knew where they would surface again. There was always at least 1 grownup staying at the original entrance to make sure we'd find it again if something should happen. Hjördís came along, too and I think she liked it (except for walking so much).
After a good break, grilled sausages and marshmallows we went for a walk uphill to show the group a sandrock, where countless people engraved their names. We use to go there from time to time, fresh up our names and add the year. Ingólfur has been really interested in this area and knows a lot about it, so he kept telling the boys facts and stories, which ended in one of them asking him if he was a scientist. Think he was rather proud of that.