For longer trips about $400-$800 for trips

Acceptable proof of citizenship includes a U.S. state-issued original or certified copy of their birth certificate (hospital certificates are not acceptable) or a Consular Report of Birth Abroad, or a Certificate of Naturalization and a government-issued photo ID (such as a driver's license). US Passport is recommended if available.

You use your room key as your onboard payment card to purchase things on the cruise ship.

Essentials include swimsuits, sunglasses, cover-ups, sundresses, comfortable shoes for beach days or pool days, and a light sweater or jacket for cooler evenings. Tennis shoes for the gym or exploring cities in port are always a good idea.

The price of your cruise vacation includes:

• Ship accommodations
• Ocean transportation
• Most meals onboard
• Some beverages onboard
• Most entertainment onboard