I have done it twice at the HLE and it worked perfectly. Keep in mind especially on weekends, there will be many people doing the same. You will need to bring the car to their garage (part of a private parking facility) and take a small elevator down to the ground floor. HLE has at least two shuttles taking people to the cruise ports. You may want to drop everyone off first on the first floor before returning your rental. Have a good time on the cruise.