Check the price of a car rental, be sure to find one that doesn't have a one-way drop off fee. Here is a website that gives 800 numbers for the major agencies. http://www.airportrentals.us/resourc...ee_numbers.php
They can tell you the nearest place to your port. For 5 people it should definatly be cheaper. That is what we are doing. It is costing us just under $40 total each way for everyone.