Not an expedition ship but in the same geographic area. On Sojourn last year, there was snorkel equipment available from the ship. We brought our own because I'm a difficult fit for a mask and my husband is a difficult fit for fins. He also likes to wear a flotation belt because he's not a strong swimmer. Yes, it's a pain to bring your own but in my mind, that's why we have it. No, we're not thinking these excursions are an extensive snorkel trip but even short excursions are a pain if nothing fits. At the Great Barrier Reef, we were given stinger suits (Very attractive) and flotatons vests to wear and I was really glad we got the vests because the water was extremely choppy. So if you are on an excursion, some equipment might also come from the tour operator.