I will be staying at Plaza resort in Oct coming from U.S. Any issues with the power on the island - are camera battery and other batter chargers going to be OK or should I be investing in a universal power converter?

Island electricity is 127 volts at 50 Hz.
Take look at your chargers; most are rated 100-240 volts and 50-60 Hz.
If yours are so rated you are good to go.
One bit of advice is to not leave any charger plugged in longer than necessary to charge the device.

Angelo-
Enjoy your stay at the Plaza. If you see Alex or Carolyn or George at the Toucan Diving, please tell them Nick and Britta said "hello."

I fried my charger by forgetting to unplug it before I went out for dinner, it was a nice 4-AA/AAA MAHA charger. Thank goodness my friends had one I could rotate my batteries with. Do take a surge protector not a power strip which was my mistake. I grabbed the wrong one.

Fried your charger? So I guess then I really should be bringing some kind of transformer and surge protector.

The largest problem with the local electrical grid is that is 50 Hz instead of the 60 Hz USA standard.
This causes anything designed for 60Hz ONLY to run hot.
A transformer will change voltage but will do nothing to change the Hz.
Hz=Hertz=cyclic rate.
A surge protector cannot hurt.

I charge my laptop with the local power and have had no problems. I am careful to only charge it for the minimum time required and then unplug the charger from the wall when it is done.

thanks. I was just going to ask about charging laptop. have not brought one with me before but will need to in December

A small update on the 50Hz versus 60Hz. The frequency difference is only really noticed on electric motors which use the frequency as the timing pulses for the motor to rotate. A motor designed for 60 and running on 50 does run a bit hotter. For example your hairdryer will be one of the devices. Fridges likewise complain a bit but it is common practice to buy US fridges and run them off of the 124 VAC that comes out of the wall socket. A transformer to correct the voltage is always useful as it damps out the spikes that the WEB send down the power lines all too often.

Regular transformed equipment such as Laptops don't suffer from 50/60 too much. A typical Dell Power Brick will say 100-240V 50-60Hz. Anything rechargeable (shavers, GPS, torch) check the charger for the magic words.....

Surge Protection ? Hmmm. I leave my laptop plugged in all the time and have survived. But the ADSL Modem got fried by a surge so its up to you