Hot sunny days provide great snorkelling times and huge turtles swim with us in the surf as they graze on the seagrass growing close to shore. The fish cluster around them, eating the particles of food disturbed by the turtles. Iguanas and crabs lie along the rocks at high tide.  The finches made famous by Darwin show little fear and hop around the cacti near us. The Interpretation Centre, San Cristobal, shows the history of the volcanic Galapagos Islands have had a variety of influxes of people, from Norweigans expanding the fish canning business to  Ecuadorian prisoners incarcerated under extreme conditions. The flora and fauna found here are mainly related to those on the west coast of the americas and able to survive on flotsam in the currents until washed up on land.  It was interesting that the Interpretation Centre gives the future aim of the islands as encouraging sustainable tourism through far less people visiting who pay far more money (not sure this will be cruisers?).