Port Blair is the Capital of the Andaman and Nicobar Islands, this city is the combination of Natural beauty and urban modification. It comprises of people from all over India and one can imagine it as mini India with no conflicts on region and religion. Aside from Cellular Jail, there are quite few places which include Ross Island, Barren Island (known for the only active volcano) and few others known for its historical importance. A week's trip will cover the must see places at the island's. You can however do day trip to other close by places like Wandoor, Ross Island etc.