Lisa
Perhaps you could mention to the tour operator about the pre-paid parking that's now no use because of the time change. You never know they might offer you a voucher or something towards re arranging your car parking or at least be able to find you a competative deal.
Try to be positive. Loads of people are having their flight times changed this year. (especially in Turkey where I'm going

) I think many people would prefer your new times. The old ones mean't arriving in the middle of the night and you would have been without a room for an awful long time on the last day.
I know its so annoying when it happens, especially when it means having to take your kids out of school for an extra day. Try not to let it spoil it for you though, after all looking forward to the holiday is part of the pleasure. You will be able to go in the pool on the afternoon of your first day, check the place out and have a nice evening meal, and hopefully won't be as tired as you would have been on the next day.