You do not need to carry big quantities of clothes especially in summer when temperatures are high. In addition, local clothes are very affordable. Swimsuit and towels are advised (some accommodations do not furnish personal towels). Electric devices adaptor is not needed if you are from US or Europe. If you are from another country and your Electric devices standards do not fit US or European standard, you will then need an adaptor. Do not forget a first aid kit with sun cream and medicine in case of stomach issues.