We only had issue with locals on Kauai. One restaurant dropped off our food without staying anything, waitress just walked by and dropped plates. Never checked in on us, didn't refill drinks, we had to go to register to pay while locals were having the opposite treatment.
Per Oahu, I fished from Alamoana Mall to Diamond Head and back several times. We didn't have a car. The beaches fill up with Starbucks drinking tourists before sunrise and scare off the fish. I really only got into lizard fish from this stretch.
I would suggest getting a loaf of white bread and head to the park in Waikiki. You can feed monster bonefish almost by hand. Mantis shrimp seem to be the preferred food of the local bonefish.
All the beaches are public if you can access them. I only came across one fully nude person while walking the shores.
I will send you some drop pins in a private message.