If you want the freedom to roam the island and stay at a different beach front location each night, for less than the cost of renting a car, TheGlamper is the way to go! First off, this is not for everyone. If you need to be in a hotel room, this is not for you. You will need to be okay with sleeping in a van. That being said, if you're going to sleep in a van, Hawaii is certainly the place to do it! TheGlamper is a mini van, converted with a bed, sink, counter top, fridge, camp stove, power station and storage. It also has blackout panels for all of the windows. These work VERY well for sleeping in! As far as keeping yourself fresh, many of the beach parks provide showers. This sounded interesting enough for me to give it a shot. After experiencing this, "way of life", I will most definitely do this again. Daniel is a great host and will give you the heads-up on some nice places to pull in for the night.
Peace, Dave