We fly into MCO this Thursday, and I have a car booked through National for 1 night, returning at the Dolphin. Originally our plan was to stay offsite for 1 night prior to checking in at CSR, and I was going to return the car Friday after dropping our luggage off at the resort. But I found a great rate for the Swan, so we are now staying there the first night. I am thinking it will be easier (and avoid a parking charge) to just return the car to the Dolphin on Thursday evening after we check in at the Swan, instead of keeping it until Friday. But I am hesitant to change the reservation just in case we were to decide we want the car Friday morning. Since it is just a 1 day reservation (paid for with a free day, at that), I don't need to bother changing the reservation, do I? I can just drop the car Thursday night with no change to the cost?