You will be happy with either Oahu or Kauai for surfing/diving. Oahu has great diving and great surf, famous surf too at pipeline! Kauai is great if you want to be with less people in general, away from all things mainland (Carl's Jr, big shopping complexes). Our Captain is a local boy surfs almost daily and does private teaching gigs sometimes when he is available. He often goes out with our divers for fun. He loves to surf, it's his passion. Let me know if you decide to come to Kauai would love to give you more personal suggestions! From what I hear and see on scuba board Scott the duck would be the guy for you if you decide to go to Oahu! Feel free to IM me with any more Q's! No matter which island you chose Hawaii is the right place!