Below are links to pages with current information on the things you must have before you apply for a Ghanaian visa. You have the option to apply directly to the nearest Ghanaian embassy or you could use one of the visa and passport acquisition agents listed for a fee.
GETTING YOUR VISA FOR GHANA
VISA HQ – They can get you a passport. And also a visa to practically any country. Caters to only US and Canada nationals
Ghana visa requirements
American Passport – Offering international visa acquisition services
GENERAL INFORMATION ON GHANA
Ghana on Wikipedia
Ghana government official website
Travel guide books and other books on Ghana
GHANA AFFORDABLE SIGHTSEEING TOURS FOR VOLUNTEERS
Tour Accra, Cape Coast, Elmina, Kakum and Kumasi
Best primary and junior high schools in the Accra metropolis
Top creche, nursery, kindergarten (including Montessori preschools) in Accra, Ghana.
Volunteer or intern in Accra’s best preschool (creche, nursery/reception, kindergarten)