Have done this lots of times for up 2weeks at a time with just enough clothes to pack in my carry-on. Take a couple tank tops, a couple pairs of shorts, 4-5 swimsuits, 3-4 sundresses, a pair of flip-flops, a pair of dressier sandals, snorkeling equip, and Extra-Strength Excedrin. Roll all your clothes tightly and place heavier items (shoes, etc.) in carry-on first, ending with lighter items. I buy other neccessities (mascara, hair products, sunscreen, aloe) in Negril. Have all my clothes washed a couple times while there, which has never been a problem at the places I've stayed. Think I paid $5 a load the last time.