On a wind blown shoreline on the south shore of Kauai is an interesting cave and sinkhole where paleoecologists and archaeologists have excavated.
What they found was a fossil picture of how Hawaii looked 10,000 years ago.
Local Kauai resident and student at Northern Arizona University, Mary Coulombe, served as an intern at the cave this past summer for college credits toward he degree in environmental science.
Here is the excellent video that Mary produced during her internship: http://www.youtube.com/watch?v=u2L4sluOb-o&feature=colike
Only on Sunday from 9am to 2 pm can visitors tour the cave and the beautifully landscaped trail and surroundings, which have been planted with native and endemic trees, shrubs and foliage.
Drive to Po'ipu and go left toward the Hyatt. The road will turn into a dusty and bumpy dirt but don't worry about the rental car. I used to take my Honda Civic to Mahau'lepu often and never encountered a problem or any sort of damage to my car.
By the way -- don't forget to check out the giant tortoises who are weed eaters "extrordinaire". They don't seem to liket the native plants!
For more information visit this website: http://cavereserve.org/index.php