I am traveling for one week to briefly work alongside a non-profit that is implementing a healthcare intervention in Ghana. I am a US citizen. Do I need a visa?
Source / Credit: http://www.ghanaembassy.org/index.php?page=visas
Yes you certainly have to get a visa for the purpose you want to travel for please see this links for more information ghana visa processes
To help you plan your trip you can also see these links as they come in handy
Also use the following travel blogs and websites to help you plan your travel to Ghana