You can read John Corcoran's story out of San Diego here.  It is an intriguing older story -- if just for the fact that he has made a cottage industry of his shame, complete with a foundation and books -- which might be the only reason this got any press after all these years.

Nevertheless, I will use this story just the same to reiterate that you can homeschool your children better than the public school system -- academically, spiritually, and socially.

I will add that I spent a short time as a literacy tutor, volunteering in Washington when I was in the Army.  You might consider it a good homeschool activity for your older teens (under proper supervision).  There are literacy organizations in nearly every community in the country.  And, given the decrepit state of education in our nation, literacy volunteers are sorely needed.

It is an opportunity to teach someone in need of a functional skill and an opportunity to be salt and light.  You could even start a program at your church. 

When Kathy and I lived in Irvine, we saw an opportunity to reach the large Persian and Asian populations for Christ by starting free ESL (English as a Second Language) classes at our church.  It was great time of fellowship, witnessing, and meeting new friends.