Ken at Rainbow Scuba has by far the best deal for scuba diving in Oahu and all of Hawaii for that matter. Unbelievable rates - $85 including all gear for a 2 tank boat dive. He is courteous, professional, makes you feel comfortable from the get go.
He picked me up at my hotel in Waikiki right on time, and we had a fast efficient outing, 4 hours round trip (7 am - 11 am). We had a nice catamaran boat and Ken set everything up, a very smooth operation. We went to the Sea Tiger shipwreck, about 90 feet down and it was fantastic. Ken took a bunch of pictures and one of the best features of his shop (besides the AMAZING price) is he generously posts all the photos on www.rainbowscuba.com using the flicker server. And he keeps them there long enough for anyone to finish their vacation and go home and download later on. All for free.
I left my sunglasses behind by accident and Ken called everyone to find out who they belonged to and even offered to drive over at night to my hotel to drop it off. Its this type of top notch service that is unparalleled anywhere else. Honestly, it was one of the best dive experiences I've ever had. Ken also took us through the shipwreck safely and made me feel comfortable about it.
I went to Maui after Oahu and paid $172 for a 2 tank boat dive including gear from Lahaina Divers. And then they wanted $60 for a ridiculous CD of the pictures. It was a complete ripoff. Yes, they had a nice boat and we went to Lanai island (amazing dive also), but the price was more than double and no photos.
Rainbow Scuba on Oahu is simply the best dive shop and has BY FAR the best prices around. I don't know why all vacationers don't go to his shop. Maybe they don't know, but should, so spread the word!!
-Andy from San Diego