What is the Marine Tourism Industry? There is no estimate of the value of the marine tourism industry; however, there is no doubt that the annual turnover is substantial and that it forms a significant business sector with widespread economic influence. This is a particularly so for island and coastal communities, where marine tourism can forms the single most importat economic activity ....Because so many businesses, government agencies and other organisations (such as sport clubs, and environmental groups are involved in marine tourism it is difficult to defip the industry tightly