We managed to fill a day sightseeing, then moved on to Mahabalipuram and later Pondicherry. And were very pleased we made the trip.

Uber worked fine from the airport: reasonably clear instructions on where to go for the pick up. Though with an indian number, it's easy to synchronise things with the driver - might not be so simple without the sim.

Hopes are not so high for Kolkata, the remaining metro on my list.