The popular image of cruising is a modern, mass market ship filled with literally thousands of people freighted from one familiar port-of-call to the next; not so eco-cruising. As the name implies, eco-cruising is all about the exploration of nature and the environment from the vantage point of the earth’s oceans, seas and rivers. The expanding appeal of environmental tourism in general and eco-cruising in particular is evident in the great number of options a …