After visiting 4 islands of Azores, Terceira is my favourite one. I guess except the beautiful scenery and lovely imperios, the experience I had with Juca and Marisa takes a big part.
I started contacting with Marisa long time ago, and she was always patient, tried her best to answer my questions. Juca knows everything about the island, and be prepared, he likes making jokes(good ones, you will love them). And they are both passionate with photography, you may ask advice from them.
Actually I spent most of my time on the island with them, from sunrise to midnight...And there's too much to say. Anyway if it's your first time visit, you must join their tour, if not, then you have to come back and explore the secret spot with them!