India suggestions

Dear travelers: I may be going on a dive trip to India in April, and will end up in Chennai at the end. Can anyone who has been there suggest places to tour from there? Should I stay in Chennai and look around there, or should I go somewhere else? I will have a crapload of gear, so lots of local flights are not ideal unless it is easy and inexpensive to fly back to Chennai for the outbound international flight.

Thanks, in advance!