Just a few simple reminders so that you are prepared:
Insurance
Check you have sufficient cover as medical charges are expensive in the US and in general you will need to present a credit card before receiving treatment.
Drugs
If you are on medication make sure you declare it or if you need additional supplies have a prescription or take them with you be prepared as supplies will be expensive in US and it saves the hassle of Insurance claims on your return. Check before you go if your medication is legal in the US.
Money
Make sure you have enough to cover Emergencies. If you have travellers checks keep a record of the use and keep your paperwork separate to avoid any unfortunate incident and you end up losing the lot. If you separate the paperwork at least there is some redress on claiming the lost cheques if required. If you lose them contact the issuing agent.
Carry only as much as you need for your days out or split the money between you if you are going on a shopping spree.
Use a money belt or something similar and leave your spare at home some villas have safes.
Credit Cards
Before you leave check the expiry date and keep them separate if you have more than one. Take a telephone number of the credit card customer service line just in case you lose your cards so that you can put a stop on the cards.
If you are planning on using them when you are abroad it is worth while giving your CC company a ring to tell them before you go. Because if they see uncharacteristic spending patterns they may stop the card because of possible fraudulent use, this is very embarrassing if you get to the till and your card gets refused.
Tickets
Keep them in a safe place in case of difficulties contact the handling agent at the airport.
Passports
Check it is in date and you have at least 12months on it after your return date before travelling. Take a second type of picture ID with you (drivers licence) and leave your passport in the villa, as replacing a lost Passport can be very time consuming.
Travel info
Before you go check to see if there are any current topical issue on the following website:
www.fco.gov.uk/knowbeforeyougo
It currently contains items on the US as follows: News overview, Local laws and customs, local travel, Visas, On arrival/departure and health.
Be prepared and help your holiday in your villa go nice and smooth.