RE: maui rental cars
If you're an "alien" (i.e. non US resident) and cannot use your own car insurance to cover the rental car, don't forget that the cost of insurance exceeds that of car rental itself, so don't look at the rental rate only, otherwise you'll have a big shock.
Al West's windsurf vans are definitely expensive to rent, even the cheaper ones. All winsurfing rental companies will supply roof racks foc if you rent gear from them.