Anchor in 15m or so in sand. We experienced light roll coming from two directions so little point setting the stern anchor. Not uncomfortable though. Worth it for the lovely beaches, gorgeous blue water and great snorkelling. A tourist vessel based in Havannah Harbour visits here daily - for good reason. There is good snorkelling right off the beach but the best sites are the two reefs the surf breaks over, both have dinghy moorings on them. These are also loaded as YIT snorkelling sites. The cliffs along the southern side of the bay look like they would make for a lovely kayak or SUP too.
A ship in harbor is safe, but that is not what ships are built for.