We have reserve cars in Kona and Kauai. I also reserve a spot for whale watching in Maui. In Hilo, I reserved Dolores and I for a 45 minute Circle of Fire Helicopter tour with Blue Hawaiian. None if these were through Princess. If any one would like the details of who and how I booked, just ask.
I am still working on Honolulu and what to do the afternoons in Maui and Hilo. I am disaspointed that we leave Hilo early in the afternoon and this is such a cool place to exlpore.