Board a natural picket boat for a conventional caldera tour, prevent for swims, seek advice from the volcano
https://dallasxcsa385.talesignal.com/posts/santorini-guided-tours-what-to-expect-and-top-routes-to-book
Board a normal wood boat for a basic caldera tour, end for swims, talk over with the volcano, and have fun with onboard testimonies and snacks.