Consider renting a car for the trip since public transportation is limited and ride-sharing services can be expensive. Car rental fees typically start at $30 per day, and driving around the island can take about 30-45 minutes depending on the destination.
If you have more time, consider hiking the Manoa Falls Trail or going on a snorkeling adventure in Hanauma Bay. If you have less time, skip the hike up to the Diamond Head State Monument and spend more time relaxing at the beach. Don't forget to bring sunscreen, a hat, and plenty of water as the tropical temperatures can be deceiving.