The My Explorations portal is the best place to view all onshore explorations available for each port on your itinerary.
If an onshore exploration is sold out, it will still appear in the My Explorations portal and be clearly marked as sold out. In some cases, a waitlist option may be available for you to select.
If an onshore exploration does not appear in the My Explorations portal, this indicates that it is not being offered for that port or on that day.