Agree with Brian re CC being probably the best method of getting cash and purchasing when abroad.
I would add that it is worthwhile letting your card provider know roughly where you are going and what you are likely to use it for. CC fraud happens everywhere and by letting the provider know you are on holiday in, say France, they would know that a purchase in the USA during your holiday period is likely to be fraudulent - this based on a real example.
The providers have some very clever software to spot unusual transactions but it is still wise to inform them. If they just think you are "abroad" they may not pick up anything unusual.