Glass Beach and Keyhole Cave (Port Allen, Kauai, HI)
This area has something for everyone. The beachcomber will appreciate Glass Beach (which is actually a black sand beach) which also contains an enormous amount of (finely ground) sea glass. I’m guessing it’s the remains of thousands of discarded beer bottles.
At low tide a few ponds appear.
And if you continue on the dirt road to the east, you will find several interesting sites; one is a very old cemetery on the top of the hill and if you follow the narrow dirt trail leading eastward you will come to what they call Keyhole cave. It’s less than a quarter of a mile stroll.
For even more adventure, scramble down to the lava bench in order to view various bridges and caves and dramatic sea spray. The black rock right next to the water can be slippery but we found that most of the dry rock had plenty of traction and we were fine with our Tevas. Our 10 year old and 13 year old did fine but for kids younger than six or eight years old it’s probably not recommended. But if you are a photography buff I highly recommend this location to you.