I have never been to Lanai, so I cannot comment on that, but I did not love the Big Island. It is SO different from the other islands in my opinion. We stayed in Waikoloa area. It is interesting to see, but 3 days was plenty long enough for me there and I don't have any desire to return. Maui and Kauai on the other hand I keep going back to and never tire of visiting. Wouldn't they love to see the Napali Coast and Waimea Canyon and Mt. Haleakala and the road to Hana? I would definitely vote for Kauai and Maui over the Big Island any day, but that is only my opinion.