Auroville is a township in Villupuram district Tamilnadu that comes under Pondicherry. Built by Mother, meaning is dawn city. Here are some things you could do Visiting Matrimandir
Stroll on Auroville beach
Join yoga and meditation Explore Savithri Bhavan
Rejuvenate at Botanical garden
View the calm Bodhi beach. Chennai airport is the nearest while there are regular buses from Chennai. To stay there are lot of resorts, hotels, homestays. https://www.tripoto.com/puducherry/trips/bienvenue-pondicherry-et-auroville-trip-to-pondicherry-auroville-7073
Kindly check the above Tripoto link for more details. I visited Auroville 4 years ago we stayed in Pondicherry.