Bodysurfing, swimming along a coral reef, swimming down a river, dipping in cold water, kayaking for a swimming friend teaches all kinds of valuable life lessons for children.

Gever Tulley is the founder of the Tinkering School. He explained in his TED Talk [see below] five dangerous things you should let your kids do and describes why a little danger and these fiver things are ultimately good for both kids and grownups: 1. Play with fire.2. Own a pocket knife.3. Throw a spear.4.