Don´t go with the Charles Darwin Tour Agency
The Charles Darwin Tour Agency in Puerto Ayora Sold us a tour to Bartalome Island for $100 per person for which we woke up at 5:30 in the morning. After waiting for an hour on the street we saw that no one was coming to pick us up. This is a bad agency and they promise you things that they can´t supply and they don´t tell you until you come and complain. Avoid them if you can.