The following is a simple packing list of things to bring to Jamaica.

Airline ticket
Aloe Vera
Anti-itch cream
ATM card
Beach attire (bikini, cover ups, trunks, etc.)
Beach bag
Beach shoes
Book (for plane ride)
Brushes/comb
Camera
Curling iron
Deodorant (solid and spray)
Feminine hygiene
First-aid kit
Hair spray
Hat
Headphones for plane (1/8" jack)
Health insurance phone number
Insulated cup or mug
Lip balm
Lotion
Luggage locks
Make-up
Medicines
Money ($1 and $5 US bills) for tipping porters/etc.
Pajamas
Passport (do not pack in check bag - with visa, if required)
Pen (do not pack in checked bag)
Phone charger
Phone number list
Photocopied ID/passports
Picture ID (for example a drivers license)
Power converter (voltage converted) and outlet adapters, if required
Power strip
Playing cards
Rain coat (especially during rainy season)
Razor
Sandals
Shampoo
Shirts
Shorts
Socks
Something to secure electronics with
Sunglasses (including reading)
Sunscreen (high SPF)
Toothbrush
Toothpaste
Tweezers
Umbrella (especially during rainy reason)
Underwear
Video camera
Watch
Water bottle
Water shoes/crocks
Ziploc Bags (gallon/quart)