I have read that all car rental companies have a shuttle at HNL. I also know that some companies have a desk in the terminal but others (i.e. Alamo) have a shuttle to take you to an offsite rental office. How inconvient is that? I am especially concerned about the return process and time involved in returning the car. Also, from what I have researched, the only company that I know allows for a second driver w/o a fee is Alamo. Any others? All help would be appreciated!