There may have been a few cabs or tour guides available at the ports but I don’t remember them. We utilized a combination of ship tours, third party excursions and rented a car in Hilo and on Kauai. The ship's excursions seemed expensive, but they offered some unique options. We did a tour with Roberts Hawaii on Maui that was priced less than Shore Excursion Group which was even less expensive than the same tour with Norwegian. It pays to shop around. If you are comfortable striking out on your own and like to do your homework before sailing, renting a car is a great, affordable option. HOWEVER - the overnight parking on Maui was complimentary and right in the port. On Kauai, they had you park at a nearby shopping mall for $20, then either walk or shuttle back to the ship. We found "public" parking closer to the pier and avoided the "extortion fee". They don't tell you about that option.