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If the vast majority of your time is going to be spent beaching and sight seeing, I would recommend Kauai as it is beautiful over here and not so developed as Oahu. All depends on what you are...

I live on Kauai.
There are flats here with some oio (bonefish). Unfortunately, the fishing and catching isn't very good. I don't even go myself.
There are reservoirs which contain peacock bass. ...