Thanks you all for the very informative information and those weather charts are excellent.I think you'll find crowds anytime of year, but your choice of an island to visit will certainly affect how big the crowds are. Honolulu and Waikiki have the largest crowds by far. Maui can get crowded in the resort areas. The east coast of Kauai is also congested. It's much harder to find crowds on the Big Island, because... well, it's big. As Slip will probably tell you, you can't find a crowd anywhere on Molokai.
As far as the best time to visit, we avoid December and January because those are the most likely months to get rain. If you want sun, the best places to stay are on the southwest side of mountain ranges. The moist trade winds from the NE get pushed up into the cool air of the mountains, and the air is drier and sunnier by the time it gets to the SW. Here are some good weather charts and maps for each of the islands.
Well we have eliminate looking to stay from Thanksgiving to February 2025.