at o'ahu, the public bus is great. on the other islands, rent a car is the best way.
if you got 8 - 10 days, remember that the flight to narita is 7 hrs, transit is 7hrs, narita to honolulu is 7 hrs. total is 21 hrs via northwest. To/fro is 42 hours which is abt 2 days leaving you only 6-8 days there.
if you fly china airlines, cheaper but i think transit is 1 day in taipei!
if you fly the other japanese airlines like ANA or JAL, it's quite expensive.
If you fly Northwest, remember to apply for WorldPerks frequent flyer program...this is the best program to gain free travel next time....
Back to the Hawaii....In Oahu, bus is no problem, it's $2 per trip and can ask for transfer if require to change bus...Also since you are on free and easy, you may consider taking those airport shuttle to Waikiki area....it cost about $14 round trip...it's comfortable and efficient :thumbsup:
With so many days, you may consider venture to the other island....or take day tour...Such as Deluxe island tour etc....Can also spend a day or two on outlet shopping or visiting Ala Mona....
Actually a copy of travel guide either from National Library or purchase one will be useful...I recommend DK's as I find it has the best quality....Ok...something for you to warm up your trip :lovegrin:
If you join the grand island tour...it's pretty std...they will bring you to almost all the scenic places on the island such as blow hole, china man's hut, pali lookout, waimea fall, polynesian central, hanauma bay, dole plantation etc etc... :thumbsup:
Of coz there are other worthy place such as Pearl Harbour, Downtown Honolulu, museum and palaces etc :thumbsup: