from there take the NHAI highway via tumkur to blr (excellent road - doable in a day)
then from blr -> hosur -> krishnagiri -> vellore -> arcot -> tindivanam -> pondy. (around 6-7 hrs)
from pondy you could drive up east coast to mahabalipuram or chennai (1-3 hrs)
or drive south along cuddalore distt coast
or drive inland to thanjavur / gangaikondacholapuram / karaikudi
on way back if you want to visit thiruvanmali use tindivanam -> ginjee -> thiruvanmalai -> krishnagiri -> hosur -> blr route. Ginjee fort is also worth stopping in.
another route is from pondy -> mahabalipuram -> kanchipuram -> madras highway -> krishnagiri if your woman want to shop for sarees.
since you'd need to be a tbhp semi-insane type to do this anyway, so on way back you should likely do this:
from krishnagiri turn south and do
dharmapuri -> salem -> coimbatore road -> connoor -> ooty -> bandipur -> mysore -> kabini lodge -> mysore -> shravanabelagola -> hassan -> belur/halebidu -> charmadi ghat -> mangalore -> up the west coast to karwar and goa -> mumbai.
