The Caribbean is the world's most popular cruise destination, and packing for it is simpler than most first-timers expect. The climate is consistent (warm and humid with afternoon rain showers possible), the dress code is relaxed compared to European sailings, and the ports are mostly walkable with limited formal requirements. Here is what you actually need.

Clothing: The Count

For a 7-night Caribbean cruise:

Day wear (sea days and port days):

4–5 lightweight resort casual outfits (shorts, sundresses, linen shirts)
7 pairs of underwear and socks
2 swimsuits (so one can dry while you wear the other)
1 cover-up or lightweight sarong
1 pair of casual walking sandals with secure straps (flip-flops are fine on the ship but poor for port walking)
1 pair of athletic shoes if you plan excursions involving hiking or cycling

Evening wear:

Mainstream lines (Carnival, Royal Caribbean, NCL): 2–3 smart-casual outfits for themed nights; 1 semi-formal outfit for formal or elegant night
Premium lines (Celebrity, Princess): 2 semi-formal outfits, 1 formal option
Luxury lines (Seabourn, Viking): As above, and you'll feel underdressed in basic shorts at dinner

Practical layers:

1 light cardigan or thin long-sleeve layer for air-conditioned indoor spaces (ships run cold inside)
1 packable rain jacket or poncho for tropical downpours
1 lightweight pair of long pants (useful for cooler evenings and more formal ports)

Sun and Beach Essentials

The Caribbean sun is intense year-round. This section is non-negotiable:

Reef-safe sunscreen: Many Caribbean ports (Cozumel, Bonaire, Belize, Hawaii) legally require reef-safe formulations. Bring enough for the full trip — ship store sunscreen is expensive.
After-sun lotion: Aloe vera gel for the inevitable first-day overexposure
Sunglasses with UV protection: Polarized lenses are best for water reflection
Wide-brim hat: More effective than SPF 100 for face and neck protection on port days
Waterproof dry bag: For the beach, tender trips, and any excursion near water

Port Day Gear

Collapsible daypack: Fits beach gear, water, and purchases. Bring a small padlock.
Reusable water bottle: Hydration is critical in Caribbean heat; ship water is free
Small amount of local cash: USD is accepted nearly everywhere in the Caribbean, but smaller vendors may not take cards
Copy of your SeaPass/keycard: Photograph it in case you lose it in port
Waterproof phone case or pouch: For beach and water excursion use

Documents and Valuables

Passport (always bring the original, even if your itinerary is technically passport-free for US citizens)
Travel insurance documents and emergency contact list
Credit card with no foreign transaction fees
Prescription medications in original labeled containers (enough for the trip plus two days)

What to Leave Home

Formal ball gowns / black tie: Unless your cruise line specifically requires it, this is overkill
Hair dryers and straighteners: All cabins have them (some are weak — bring your own only if hair is a priority)
Full-size toiletries: Ship-provided shampoo and body wash are adequate; bring only specialty items
Too many shoes: One sandal, one athletic shoe, one dress shoe for evenings. Three pairs maximum.
Candles and power strips with surge protectors: Prohibited on cruise ships

Space-Saving Tips

Roll clothing rather than folding — genuinely reduces volume. Use packing cubes for compression. Wear your bulkiest items (jeans, boots) on travel day to free luggage space. Pack swimwear and one outfit in your carry-on in case checked luggage is delayed to your cabin.

For a full gear comparison and Amazon-sourced product recommendations, see our cruise essentials guide.