Well, I'd add that two days on the west side and two or three days on the east side is nowhere near enough time for the Big Island. You really need at least 8-10 days to cover both sides of the island, and the majority of that should generally be allocated to the west side. On the west side, I prefer the Kohala Coast to Kailua Kona for better weather, access to beaches, and better accomodations.
With regard to your east side stay, there's really no reason to stay in both Volcano and HIlo . They're just about 45 minutes apart. You can base in one or the other and visit each one as a day trip, depending on your interests. Volcano has a lot of very good lodging options and if your primary interest is in VNP, particularly if you're hikers, that's where I would base.
I also note from your Kauai forum post that you're planning to come in October. You will want to be aware of the Ironman in Kona on October 13, and plan around that. Also, it sounds like you're only planning six nights on Kauai and are thinking about 4 or 5 nights on the Big Island? I wouldn't do that. With 10-11 nights you can do two islands, but I would go with Maui and Kauai, or consider spending the whole time on the Big Island. If VNP is really a must do, then I'd skip Kona altogether and just stay on Kauai and come over to VNP for 2-3 nights.
I agree with Shea on every point.
If you can rethink this a little it would be for the best.
Don't change to a third lodging on this island, complete waste of time and energy.
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