An amazing experience - of a lifetime for people my age! Darwin Alvarez was outstanding! In many trips abroad with many leaders, I have never come across anyone with such a complete knowledge of his subject(s)! History, geology, meteorology, birds, fish, plants, insects - awesome! His self-taught English was also flawless - so were his diving/snorkelling abilities!
The highlight for me was Genovesa Island. The birdlife there was outstanding. I would strongly recommend that this is included in future tours, if possible. Very knowledgeable guides in all three places - Quito, Galapagos and Sacha.