Good morning Liciano,
You signed up for Dolphin and Whale watching experience, not for diving trip.
We always inform our guests swimming is not the priorty on this activity, as you can swimm any where on the island no need to go on a boat trip!! Also, it is good to remind you that we are in our winter season, which is not recomend to swimm in the ocean due to strong currents.
Regarding not going to Cabao Girao, if the weather conditions are not good on the West side of the island, we change our route to east, where our guest can have comfartable trip and see some wild life too.
Hope this helps you to understand a little bit better.
Best regards
Umut