What a great rate! Just wanted to comment on fitting everyone/everything in the minivan. I would say it should be fine... just a very tight ride from the airport to the hotel and back. You will be leaving the luggage there and only traveling with people, carseats and strollers on a daily basis. With the luggage to the hotel you may have to have some people hold some, sit tight next to some, under feet, jammed between the quad seats, etc - LOL! I would suggest the two car seats the back seat - one on each side. Then the smallest other child between them and the other two in the quads. OR one carseat in back with two other kids and one a quad and one other kid in quad seats.
OK... how do I know.... in October we rented a mini-van with three adults (all larger size) and three kids in carseats. We also had a LARGE triplet stroller (darn thing doesn't fold down hardly at all and takes up a TON of room - almost all of the space behind the back seat). And for luggage (WE WENT TEN DAYS).... we had three LARGE suitcases, two small ones and 6 carryones plus a video case.
There were not luggage racks on top and they also informed me that even if there were luggage racks that we could not use for liability reasons.
I hope this helps! GOOD LUCK! Let me know if you have any other questions about the minivan and fitting... we also own two minivans and have tried lots of configurations (can't drive anything else with triplets!).
Julie P.