The best thing is call them: (808) 848-5555 (daily from 5:30a.m. to 10:00p.m.) and tell them where are you trying to go. They will explain you what route number to take and how long it takes. Bus usually comes every 15 min. The bus stop right across from Marine Surf Waikiki building and Ilikai Marina building. It is about 3-5 min from Holiday Village building.
It is about 15 min by bus from Marine Surf to Straub hospital (30-45 min by walk).