Jamaica is in the same atime zone as Eastern USA, but since it doesn't change to daylight savings time, it's one hour behind Eastern Standard Time during that period. Driving is on the left in Jamaica. Buses and taxis are plentiful, but be sure to agree on the price before you get in. Take only taxis with PPV plates or recommended by your hotel. Most major hotels provide free airport transfers.
Rental cars are available.
Scooters, mopeds, bicycles, and motorcycles can be rented by the day or by the week in most resort locations. Some hotels use 220 volts. Jamaica's temperatures average about 80 degrees in winter and 87 in summer, cooler in the mountains. The rainy seasons are May to June and September to October. Beachwear, of course, and other tropical, light-weight clothing, and a coverup for cool evenings and maybe something a bit dressy for evenings.