My family loved the tunnels too. But the thing that topped it for all of us was the monk seals and turtles on the south shore beaches in poipu. We spent hours just looking at them. I have no idea why but we couldn't get enough of them. Check out these poipu beaches for the best chance at finding them.
The gateway to the Koloa/Poipu area provides for a fun family drive. Long called the Tree Tunnel, this delightful stretch of Maluhia Road is just past the six-mile marker off Kaumualii Highway. The trees were first planted a century ago when they were donated to the county by a resident. Two hurricanes have taken their toll, but like all of Kauai's exuberant plant kingdom, the Tree Tunnel still thrives. The trees are primarily eucalyptus.
While this is just a short scenic drive, it is absolutely one of my kids' favorite places to drive on Kauai. I have no idea how many times they asked to drive back and forth. There really isn't a place to stop and get out of the car to look, so drive to the next intersection, turn around, and come back again.
So do you need to "hold up the roof" for tree tunnels?