Ina and I are finally engaged! And I popped the question halfway during the snorkeling tour.
This awesome place is Ilhéu da Vila Franca do Campo! An small volcano island, south of Sao Miguel. A 10 min boat ride (5€) will get you there from Vila Franca (the village). The water was clear, and there were plenty of fish! If ever travel to the Azores, you must visit this magical island!