We just strolled at the cove (not that great an idea, because of the heat), after checking out from the hotel, and then left for the airport. Thankfully, the departures area (post the security check) is all air-conditioned.
-CONVEYANCE: We had already booked a taxi to roam around Port Blair (before the start of the trip). The same guy had arranged for taxis on the other islands as well. But this may not be required, as you can get scooters almost everywhere for rent, right from the jetty. Our concern point was comfort, and hence we had booked the cab. Cost us about INR 10,000, but we were carefree for the entire 5 days as we had a vehicle at our disposal. (Also helps if you have a lot of luggage)
-CELLULAR JAIL: Light & sound show tickets to be booked in advance. Check with your hotel or driver beforehand, if you plan to attend it on the same day as your arrival.
-FERRIES: All our inter-island travels were on Makruzz ferry. (Booking linkhere). There is no travelling on the deck. That can be done in the Green Ocean ferries. We had booked for one, but the trip was cancelled due to vessel being under maintenance. The entire amount was refunded within a week (depends on your mode of payment).
Pro-tip: 1. Be alert while collecting your baggage after getting down, because there is no proper dispatch system. 2. Do NOT keep your ferry and flight on the same day. A delay in one, may lead to you missing the other.
-SCUBA: We booked for Scuba after checking in at Havelock. The hotels have tie-ups with the clubs that organise these. But these activities are better done at North Bay Island, near Port Blair.
-COST: Per person cost of this entire trip came to be around INR 32,000, which includes stay, taxi, ferry and flight charges (to and from Hyderabad). You may get it done in cheaper, if you book much in advance (all our bookings, including flights, were done with less than a month to go for the start of the trip) and if you go for scooters.
-NETWORK: Vodafone is flimsy. Airtel works decent. Neil has no reception whatsoever, except probably, BSNL. Carry a BSNL or Airtel sim for survival.
-SUGGESTION: I had assumed that Port Blair would be boring, but if feasible, I would advice a longer stay there. You can utilise one day for North Bay and Ross Island, and one more for Baratang. The latter has an active mud volcano, and you go there with a government convoy, which makes you meet the tribal people as well.