This is a radio location. As you can see, there are concrete bases used by Rhombic Antennas from WW2. The Federal Radio Company operated a commercial radio station in the 1920s at this location and provided world news to the Honolulu Newspaper at 2 cents a word from San Francisco. The Military listened from here and other locations to the North Pacific in WW2. Out of View to the right in the distance, is the location of the Kaneohe Naval Air Station, one of the first places bombed on 7 December 1941 by the Japanese Navy.
Kaneohe bay is the home of many kinds of fish, coral, mollusks, and turtles. Out of view to the far right is Coconut Island. It was used for the exteriors of Gilligan's Island on TV, and is now the home of a Marine Laboratory operated by the University of Hawaii. The US Marine Corps now occupies the old Kaneohe NAS. From the seawall we see small schools of fish, and interesting occupants of the silted bottom, as the tide rises and falls. Many activities can be seen on the bay, wind surfing, jet ski use, snorkling, fishing, and boating.