Single travelling to Jamaica for Christmas holidays

can you pls advise me:
1- which of the main resorts in Jamaica (Negril, Montego Bay etc)will have less risk of dengue, zika etc or jelly fish by Christmas?
2- which of the resorts will be a better base for one trips to the rest of the country by public buses or organised day trips?
3- are taxis in Jamaica, even at night, safe even for a lone traveller?
Thanks for your informed advise

Asked by Art via WorldNomads.com