Agree with Orchid. I have also witnessed topless females walking on the beach being subjected to rather nasty comments from local Jamaicans (particulary from older Jamaicans). Jamaicans tend to be rather modest outside their family units - I have never seen a JA female over the age of 4 or 5 topless on the beach (not even the working girls). Years ago there were sections of the beach in secluded areas where nudity was no problem, however those sections were lost when development took place.

There are many establishments where topless sunbathing is permitted and commonplace on the beach particularly if the hotel/resort caters to European tourists.
As noted, Firefly allows full or partial nudity and it is fun place to hangout with good bar and good food. Hedonism has both a "nude" and a "prude" beach for its AI guests - if not staying at Hedonism you can purchase a "day pass" which gives you full access to the resort and you can stay for the evenings entertainment.

Remember to use lots of sunscreen and limit the time in the sun - burnt blistering and peeling breasts or other sensitive areas can be very painfull and very unattractive!