Private ferries you can book online to avoid standing in long queues. water sports your choice, better book in advance you might get some discounts.. https://www.go2andaman.com/ferry-services-andaman/ message me, i can share few more related links
Thanks for your response. Could you suggest some more good places to visit as i am planning to visit for a few more days than the given iternary. Plus should i book activities like scuba etc well in advance ?