This year, we took a 6 week summer vacation. Some might think, "Why are you starting so early, why are you doing that to your kids?" I'm doing us a favor, and I'm being kind the future me. There will be a time in October when we all want to go see the leaves in the mountains or a week when it seems we are packed with dentist appointments, club meetings, soccer practice and church activities. I will not be stressed out that we are missing "school days" because we began early, and have some wiggle room.
I also keep our summer vacations shorter than the traditional break because I think it helps prevent "brain drain". It keeps us from having to do lots of review. We can just get right to it--giving us more time for learning new concepts right away.
It's also just time. I can feel it. Everyone gets a bit restless. (Including mom!) It feels good to be back in a routine and on the road to completing our 170 days of "school". (And getting all those neurons firing again!)