I have an 8th grader and I knowed it is frowned upon to take the children out of school for a trip anytime.
This past October, I took her out 2 days to accompany us on a business trip. We looked at it as an educational opportunity. Yes, she got unexcused but she did her work and turned everything in. I believe things went a little more smoothly because she is in honors classes with a's. We also let the teachers know ahead of time. I believe as long as your student is getting good grades and is a good student that it is ok........within reason of course.....
2 yrs ago my daughter was excused from an exam but at the time we were headed to a funeral so it was not a fun trip we were going on.
As for Hawaii.....ENJOY.....it is a beautiful and breathtaking place. If posssible, go on a whale watch. I think they will be there during your visit. We usually go in Feb or March and the whales are there. They always leave me speechless. Maui is our favorite.
When you fly back to DFW, take the 10pm flight from Hawaii and you can sleep all night!! That flight lands at DFW about 5:30am. We had a car service take us to and from DFW because we knew we would be tired on our arrival back home. Also...if possible.....upgrade to first class both ways...it is far WORTH it.