Southern side of Biševo Island offers a magnificent view and there is a cave you can go into with your dingy. The depth falls fast from 25 meters right by the cliffs to 95 and over 100 m only about 50 m or so away from the cliffs.
Under the highest peak of Biševo – Stražbenica (239 m above sea level) there is a large cave you can explore with your dingy but a part of the crew must stay on the boat, because the seabed is rock and it is very deep there so you probably won’t have enough anchor chain to anchor your boat anyway.