Don’t forget to bring the essentials. Hawaii is an archipelago which means that not everything that you can find in the mainland is available here. Some would have to be imported from the mainland. If, however, you find them available, you might as well expect that it would cost more than its usual price. So, it’s not a bad idea to bring your own. For example, a sun block lotion, toiletries, wine (if possible), etc.
One downside though with having your own car while on vacation is the directions. This is especially true if this is the first time that you have visited Maui or Hawaii. And even if you have a map, nothing beats having a driver who already knows the way.
Do try the famous Hawaii water sport “SNUBA”. It is just like your regular scuba diving sport, but it doesn’t require any certification and even kids can do this.