Join Date: Apr 2006
Location: Sacramento, CA or St Paul, MN
Bikes: Titus Racer-X AL/Trek 520(RIP)/Trek 930
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As most of the islands are pretty small, the LBS is probably the best source for info.
I've done riding in Hawaii, but no touring. As they're volcanic, they're not flat and the main roads can be very busy with distracted, lost tourists. Note that these are also the flatest roads.
If I were touring in HI, I'd use a mountain bike and stay off the paved roads as much as possible. These have low traffic and take you places the car tourists won't go. Kauai would be a great place for this.
That, or I'd imagine the Big Island would have more alternate routes.
Note that it can be very rainy.
I'd come in an off season.