Free: Contests & Raffles.
Forget the bear spray, use wasp killer. Concentrated delivery stream, 10X the product, and only $3.00 on sale.
First find out which part of the Island you better not infridge upon, alot of "local only" areas that are not taken to kindly to "Halees" camping in their spots. I lived there for three years quite a few years ago, just be aware of the area your planning on camping. I would go to the local PD and ask what spots or beaches to avoid for nighttime adventures... Oahu has some rough spots for sure, especially towards the west end of the island.