Port Blair is Heart of Andaman and only airport of Andaman and nicobar islands. You can reach here either by air or ship. Ships from Kolkata usually takes 40-60 hrs to reach there, it's always better to choose by air. On our very first day we have visited cellular jail and light and sound show in evening at cellular jail, which is a must do activity in Port Blair. 1 hour light and sound show gives you a brief history of cellular jail. You can get tickets of jail and light and sound show from outside jail. We were amazed to see how big and sturdy the jail is.