No, Indian citizens do not need a passport or visa to visit the main islands, though they must carry a valid government-issued photo ID (Aadhar, License, etc.).
A valid passport and Indian visa are required. Registration upon arrival at Port Blair is mandatory.
Connectivity and Money
Expect a "digital detox". Connectivity is generally poor outside Port Blair. BSNL and Airtel are most reliable.
Yes, cash is king. ATMs are scarce on Havelock and Neil Islands.
Travel Season
Peak season is September to May. Best weather is December to March.
Food and Health
Yes, vegetarian restaurants are common in Port Blair and major tourist islands.
Local Etiquette
No. It is strictly illegal to collect or take shells or coral from the beaches.