Been to Belize twice, inland and the cayes. The country is stunningly beautiful but Belize City, not so much. And the good stuff is quite far from the port. If you're on a private tour and miss the sailing time, well....(shudder)

Enjoy a quiet, uncrowded day on-board the ship.

While on the ship, plan a trip to come back for a week or 10 days and do it right.