@Francis,
Our tour is quite extensive in South India. We start in Chennai, then bus down to Pondicherry, Mahabalipuram, and Kanchipuram before we fly down to Madurai in four days. From Madurai, we go to Pheriyar for two nites, proceed to Cochin for three nites, then Hassan, Mysore, Bangalore, Goa, and end up in Mumbai for our last nite before flying home - all in 23 days.
I visited North India some years ago, and always had a desire to see South India. Finally got the opportunity.