I am 100% against a year 'round school year - kids need a break and time to be kids. We do need more time in the actual school day/year, but a lot of that could come from reducing wasted time w/in the day/schedule and distractions.
I am also convinced that a large part of the problem with our public schools is how much interference and kibbitzing there is in the school curriculum/schedule from parents, the government and the $%#^# teacher's unions. It's like how the lobbyists and special interests all screw up our government.
Teachers need to be able to run their classrooms without parents interfering and overruling any attempts at discipline. And 99% of the "self-esteem" and "learning disability" crap needs to go out the window so GRADES, HARD WORK, and LEARNING are the focus. Likewise the 3 day weekends for "teacher inservice" that just happen to fall on holiday weekends, excessive standardized tests, any electronics in the school that aren't being used by the teacher to teach, inappropriate dress, and a variety of other distractions need to go buh-bye.
Kids should go to school from approximately Labor Day to Memorial Day, with a vacation at Christmas and in the Spring, with 8 class periods a day (4 before a palatable lunch, 4 after) that include art, a foreign language, music, and gym class................but do NOT include time out of the school day for organized sports teams.
All after school activities need to end by 6 pm (so kids have time for a family dinner, homework, and sleep) or be limited to one night a week if travel (only allowed within your general geographic area for conference competition and on a big yellow bus) is involved.