While Honolulu has an adequate public transport system, it's often easier to rent a car or scooter for the duration of your trip. Expect to pay around $30-$50 per day for a rental car and $40-$60 per day for a rental scooter. Taxis and Uber/Lyft are available but can be expensive.
If you have more time, consider taking a day trip to the North Shore to explore more beaches and towns. If you have less time, skip the Polynesian Cultural Center and focus on exploring the other points of interest in Honolulu.
Honolulu International Airport (HNL) is the main airport serving Honolulu and is located 6 miles northwest of downtown.