The Roloffs pull out all the stops to transform the farm into Hawaiian paradise for their final wedding of the season. Matt's obsession with creating a flaming volcano proves to be an explosive idea with Amy and when Zach announces a major life change.

With three of four kids out of the house, Amy is feeling restless and decides to take on the challenge of climbing Mount St. Helens. Meanwhile, Matt secretly builds Amy a schoolhouse as a special gift. It's apparent that neither has plans to slow down.