If you want to tick of the touristy stuff, visit the cellular jail in Port Blair or walk through the ruins of Ross Island, the first British checkpoint of the island.
If you haven't had enough adventure, take a Kayaking session in the day or at night or walk with a Marine Biologist to explore the nearby Chidiya Tapu.
To understand the contemporary issues significant to the islands, visit the Andaman Nicobar Environment Team (ANET) centre that promotes ecological and social research and spearhead several on-ground projects focused on the preservation of biodiversity, improving local livelihoods, and much more. From there, go on for a short cruise in an authentic ‘dungi’ off North Wandoor wildlife.
The last day on this far-flung island will be at leisure and you can indulge in various activities and excursions or choose to stay in the sanctuary, read a book and day drink.