We have 13 nights and planning 4 in Oahu, 4 on Big Island and 5 on Kauai. But, we probably will never be back to the islands again, and we hate to skip Maui. Are 4 islands in 13 nights advisable? If we need to skip one of the four, which would you suggest. (we feel like Oahu is a must just for Pearl Harbor alone and the Big Island is a must for the volcanoes and we've been told that Kauai is gorgeous and Maui (while beautiful) had become more commercialized and resorts.) Traveling will be parents and 16 year old son. Thanks in advance for any advice.