Yes, you can add the Princess Plus package to your Princess Cruises booking at any time up until 48 hours before your sail date, and you can even add it once you are onboard (though usually at a slightly higher daily rate). In 2026, the Princess Plus package costs approximately $65 per person per day ($70 on Sphere-class ships like Star Princess) and is a "high-value" bundle that includes the Plus Beverage Package, single-device Wi-Fi, and four casual dining meals. To add it after booking, simply log into the "Cruise Personalizer" or "Princess MedallionClass" app and navigate to the "Packages" section. For 2026 travelers, adding it before you board is a "pro-tip" as it often locks in a lower price and allows you to prepay your daily crew appreciation (gratuities), making for a more "all-inclusive" and stress-free experience once you step onto the ship.