Documents Needed
Passport
You must have an up-to-date passport with an entry visa for Ghana. Your travel agent can get this for you or you can contact the embassy of Ghana in Washington, D.C. but realize that it may take a few months so start early.
Visa
Visas (not the credit card!) are usually good for 90 days but can be extended once you arrive. For a little more money you can obtain a multiple-entry visa that is good for a year in case you may be planning to come in and out of the country during that time.
Yellow Card
You must present proof of the yellow fever vaccination before you can obtain a visa for Ghana. You should carry the yellow immunization card with you, keeping it with your passport, as you may be asked to show this when going through customs at the airport in Accra.

