Ran aground on coral reef 30' from airport wall, perhaps 1/2 mile from Keehi Small Boat Harbor channel entrance.  It was night time so naturally somewhat dark.  I may have not seen (sic) the wall nor the reef in my attempt to seek harbor at Keehi Small Boat Harbor facility overnight for a continuous journey to Kaneohe for anchorage there, coming from Waianae Small Boat Harbor embarking earlier that day.
Honolulu                      