i went with my wife to SriLanka last July it is charming country. from experience go to Bantota city it is in the south take the Taj Exotica hotel its perfect book from expedia it will be cheaper than to rent private

and i can give a number for a driver to be with you and will make a tour for you

such as elephant riding, Tea factory, Galley Castle a lot there to be visited
their cuisine is very delicious
but max staying 1 week 10 days

PM me if you need any further details