Thanks, everyone, for your thoughtful and educated resposnes!
I discussed all your options with the decision maker (the wife). She agreed that island hopping is too much of a pain with 2 kids, so we are staying on Kauai; we'll save the volcano for another trip. Our timeshare is at the Marriott. I was able book 2 additional nights at the Hyatt for just under $400 per night. Since the flights to another island would have cost this much for the family, not a bad deal I suppose. The Princeville was an option but $200 more a night. Anyone feel the Princeville is worth $200 more per night?
I am curious as to ILuvParis's comment about "a lot to do on the island". I thought it was just a beautiful lazy sleepy island. What activities would you all recommend?
Thanks!