>>> "don't take credit cards?"
----- Would take more cash or American Express Travel Checks. Will need cash for cabs, bus, snack bars, small items. Some shops will not take credit cards for small amounts. And would not use a credit card too freely at every restaurant. For small amounts like for breakfast and lunch would pay cash.
WHY? Every now and then on one of the many Aruban BB's you hear where someone credit card # is used at another place/country after it is used. Yes, you protest and get a refund since card wasn't used but that takes time and trouble.

If you take more $$ or checks get them in $50. And with $50 bills make sure they are the newest one with all the good watermarks. Most resorts have room safes so keep excess money, passports, credit cards in there.