Can you camp in Oahu without a permit?

No, you cannot legally camp in Oahu without a permit. Camping permits are required for all city and state parks on the island. Permits can be obtained online through the State of Hawaii's camping reservation system or in person at the respective park offices. However, if you're looking for a more hassle-free camping experience, you can book a private campsite on Hipcamp, where permits may not be required as the land is privately owned.