Bicycle John is an old fixture on Kauai. He offers countless different bike models for every riding style and need, and also sells jerseys, custom bike seats, etc. He also does repairs and some bike tours!
His most valuable asset is his knowledge. You always feel welcomed to stop by with any of your bike questions.
Unfortunately, this place is a little expensive. However, for the quality of work you can't beat it.
Pros: Knowledgeable, one stop shopping
Cons: A little expensive