We are also in Texas, in a suburb of Houston. The state law here is very strict on the number of absences, as others have said. However, the law allows only
2 Unexcused absences a sememster and a
total of 18 days absent for the school year. If a child has more than 18 days absent they have to repeat that grade, even if they have straight A's. You can petition this, but you better have good records to prove why the child was absent. I personally think this is a stupid law, but unfortunately they don't let me make the laws.
DD has asthma, and it was really, really bad when she was in 1st grade. She came perilously close to those 18 days. Once we hit 9 days, we got a letter every time she missed a day. Luckily for us, the principal's daughter also had asthma, and she was very sympathetic. However, the attendance clerk at that time was old and cranky, and would regularly lecture parents that they had better not take their kids out of school so they could go to Disney World.
Having said that, we have regularly taken DD out of school a day before or after a school vacation or holiday. I just send a note saying DD was sick. This will work for a day or 2 but not a whole week. Also, we are on the Thanksgiving cruise this coming year. DD will be missing 2 days of school. It used to be the schools were closed the whole week of Thanksgiving, but now they are open Monday and Tuesday, but many, many kids are out. I have no problem with her missing those 2 days, and will likely send the "sick" note again. The school knows 99% of the kids out that week are not sick, but its just going to cause them more headaches to question it.
My point is that it depends upon the school, the school district and the teacher. You might do better in a face to face meeting where you can read the person you are speaking with. That can be hard to do over the phone. At least in our district, state funding is a big thing. Our school hates to hear that a child is leaving to be homeschooled. So, if your new school balks at the idea of taking your child out for the cruise, you might just mention that if its going to be a problem, you will just homeschool your child. That might be enough to get their attention.
Wimberely is outside of Austin, correct? Have you been there yet? You might want to get a feel for the town, and the attitudes of the people who live there. Ask some of your new neighbors how they would handle it. They'll have the best idea of how to approach the school.
And if all else fails, do as PP's have said and unenroll and then re-enroll your kids. I may try this in the future myself.
Good luck to you and Welcome to Texas!!