Yes, there is an option to go from Port Blair to Havelock Island on Day 1 of your tour, however, please not that in case the flight gets delayed or if the ferry in Andaman runs into any technical snag on the day of your arrival then by no means you can reach Havelock Island on that day of your arrival. It is recommended to go from Port Blair to Havelock Island on Day 2 of your tour program to avoid any complexity that may arrive.