Public transportation on Oahu is limited, so renting a car would be the best option. The cost varies depending on the type of car and the rental company, but $40-$75 per day is a reasonable estimate. Traffic can be very congested during peak hours, so plan accordingly. The total driving distance for the itinerary is approximately 54 miles, and the estimated driving time is 2 hours.
If you have more time, consider visiting the North Shore, Dole Plantation, or the Polynesian Cultural Center. If you have less time, skip Pali Lookout and spend more time snorkeling in Hanauma Bay.