Hey!

Just one suggestion - if you think you might need a bigger car, I would go ahead and book a bigger car now. Sometimes (and only sometimes) rental car companies will tell you that you need a bigger car and charge you several hundred dollars to "upgrade" (the highest amount I've heard is $300.) Usually they try to talk you into it, but since you're almost already convinced you might need a bigger car, you might end up feeling pressured into it.

Now, of course, if they run out of the smaller size, they might upgrade you for free, but I'd rather pay $70 now and reserve a bigger car than $150 to $300 later when I'm under pressure with the kids and the luggage and all the airport stress at the rental car company counter.