Thanksgiving week is usually the most popular for folks here to go since the kids are out of school. This year however, the kids have to make up the time missed with Hurricanes Isidore and Lili. Christmas week thru New Years is a no brainer. The kids here are out the week of Mardi Gras, but may be making up time missed for the storms also.
Here, the week after Easter is sometimes 'spring break', sometimes it's the week of Easter.
Down here, we don't get any other extended days for 'break'. However the kids rarely go to school for one month straight with out Faculty Study days, Parent Teacher conferences, etc.