I think there should be longer weekends for kids and adults. Two days just isn't enough time to kick back and relax after a long week of boring work. I propose that we should have three day weekends. Saturday, Sunday and Monday should be the new weekend.
Weekends should not be longer. As a kid myself I see that if we have longer weekends than school will last longer because there are 3 days and not 2. 2 day weekends are way more than enough time to kickback, and prepare for Monday. Besides Monday-Thursday you have quite a few hours to relax for the next day anyways.