When we were there we did the tour that went from Kona to Hilo and then to the volcano. It was a great tour, but long. I don't know why I didn't expect the volcano to stink, but I didn't and boy does it smell like sulfer. It was a great tour, however. I don't know if that is one that Carnival offers, since we were staying on the island, but it was a tour that included some beautiful water falls and gardens as well. Hope this helps a little.
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