We used Park n Cruise once. They people were wonderful, the price was half that of the port, and it felt like a secure area for our car. Downsides
, though, we parked outside, and had to wait what seemed like a long time for the shuttle after the cruise. These parking services are a great example of you get what you pay for. The terminal is almost insultingly overpriced, they rip you off by charging for an extra day, and it is covered, safe, and unbelievably convenient. Oh well, plenty of folks on both sides of the question.