The half-buried fallen fruit of a Coconut Palm (Cocos nucifera) gamely sprouts in rocky alkaline soil along the beachfront at Kealia Beach, Kapa'a, east Kaua'i.
Ironwood Trees (Casuarina equisetifolia) towering over mature Coconut Palms (Cocos nucifera) along a beach front in the Kawalilipoa neighborhood of Kihei, south Maui.
Coconut Palms (Cocos nucifera) and vines of Beach Morning Glory (Ipomoea pes-caprae) growing right down to the surf line. Shoreline of Ma'alaea Bay, Kihei, south Maui.
These coconuts are well along in the ripening process, just beginning to turn brown and developing a thick outer husk (or exocarp). If left unharvested, the nuts will harden and dry out, eventually dropping to the ground when completely ripe. 

One of the hazards of living with coconut palms is that the large, heavy nuts commonly dislodge from their stems when ripe and fall to the ground with a good deal of force. I've never been konked by one of these but have come close on several occasions.
The half-buried fallen fruit of a Coconut Palm (Cocos nucifera) gamely sprouts in rocky alkaline soil along the beachfront at Kealia Beach, Kapa'a, east Kaua'i.
The half-buried fallen fruit of a Coconut Palm (Cocos nucifera) gamely sprouts in rocky alkaline soil along the beachfront at Kealia Beach, Kapa'a, east Kaua'i.
The half-buried fallen fruit of a Coconut Palm (Cocos nucifera) gamely sprouts in rocky alkaline soil along the beachfront at Kealia Beach, Kapa'a, east Kaua'i.
See photo in original gallery.