Coconut Island , or  Moku o Loʻe , is a 28- acre  (113,000 m²) island in  Kāne'ohe Bay  off the island of  O'ahu  in the  state  of  Hawai'i ,  USA . It is a marine research facility of the  Hawai`i Institute of Marine Biology  (HIMB) of the  University of Hawai`i .