This area, now actually called "Unnamed Beach" was once part of Ko Olina Beach Park, but was cut off from it when the nearby marina was built. Here is a description of it from one of my books:
"It often has unusual-looking waves (thanks to a sandstone bench that waves smack into and prevailing offshore breezes that push the tops of the waves backward)" - Oahu Revealed
I recently sat on the sand here and watched the sunset, and that description exactly matched what I saw - I especially liked the way the wave tops were pushed back, creating a spray that glowed in the late afternoon light.
For more 'U' photos, please visit ABC Wednesday.