Join me for a short swim (or paddleboard/kayak) out to a small island of Mokoli'i off the North Shore, followed by a hike to the top. The swim is not incredibly difficult (Less than a mile), and can OCCASIONALLY be walked if it is low tide, however, be prepared and know your limits in the water.
This is my favorite hike on the entire island. Go back home and tell your friends you swam out to an island and then hiked it. Don't miss this unique outdoor activity.