Excursions are often not listed so far ahead, there will be more later. Don’t worry, if you book one then a better one comes up later it’s easy to cancel and rebook through your Voyage Planner, especially if you’re using OBC. Even if you pay by cash it’s still easy, the money just goes back to your card for the cancelled excursion, then retaken for the new one. Most excursions are cancellable up to 48hours beforehand. A few specialist ones, such as those including private drivers or overnight stays have a longer cancellation deadline, but it’s usually clearly stated.