NCL offers a 50 minute helicopter tour of Kauai for about the same price as a 30 minute helicopter tour plus a 4 hour land tour. The latter seems like a better value, but is there a significant difference in the two helicopter tours? Thanks. (Sailing Pride of Hawaii in November 2007).
Hard to say, and I don't know for sure, but I would guess you see a lot more by Helicopter than you do by bus. Having done a bus tour of kauai, I would opt for the extra 20 minutes of Helicopter - you will see as much as that 4 hour bus tour.
Much of the bus tour was just seeing long roads, much of it windey mountain roads to the top of Waimea (name?) Canyon. The view is great, but probably even better by Helicopter. And you will see the Napoli coast-line which is sensational.