I recently read a review of the Diamond in Hawaii and the reviewer mentioned what a waste of time the stop in Hilo was! Just in case you read it I want to be very clear that the stop in Hilo is definitely not a waste of time! It is the closest port for visiting Hawaii Volcanos National Park! Do It!! On the Big Island of Hawaii this is definitely the thing you absolutely must do. The person that wrote the review I'm speaking about missed one of the major attractions of Hawaii.
My other must do's for each island....
Hawaii, the Kona side....an excursion that will let you see a coffee plantation, Pu'uhonua o honaunau National Historic Park and The Painted Church. If you just want to stay in town visit the Hulihee Palace and The Mokuaikaua Church
Kauai...Waimea Canyon or alternatively take a drive up to the North Shore. Best beach...Poipu!! One of the very best things to do on Kauai is the Helicopter tour. It is well worth the $$$$ spent.
Oahu....this one is obvious! You must visit the Arizona Memorial. For more history how about a walk around Chinatown (great place for lunch), a visit to the Iolani Palace, get your photo taken by the King Kamehameha Statue and visit the Mission Houses Museum. Other options could include but are certainly not limited to.....a visit to the Polynesian Cultural Center (this is an all day event), a visit to the Byodo Inn Temple, snorkeling at Hanauma Bay or how about just a few hours on Waikiki Beach (eveyone should do it at least once in their lifetime)
Maui...always my favourite and if I had only one day I would rent a car and drive to the summit of Haleakala. Stop at Picnic's on the way up and buy a picnic lunch to eat at one of the roadside parks on the way back down to sea level. Or stop in Makawao for lunch. If you have time take a little side trip to the Tedeschi Winery. A word on Hana....while this is a wonderfully scenic drive it is a very long one over many, many, many one lane bridges and it is a road with loads of hairpin turns. It will take you all day if you stop to really enjoy all the beautiful sights along the way!!
These are my favourites. Of course the possibilities are endless and you will not have enough time to even scratch the surface of the wonderful things to see and do in Hawaii.
There is a really good site online at
http://www.hawaii.com . They have lists of attractions for each of the major Hawaiian Islands. You might want to check it out!
Aloha!