Americans travelling to Cameroon need a Visa to enter the country. They will also require severl other special requirements. We have reprinted the information here from the State's website on entry requirements but we have included links to our own resources for several of the requirements.
What you will need:
A valid passport, visa, evidence of yellow-fever vaccination, and current immunization records are required. Travelers should obtain the latest information and details from the Embassy of the Republic of Cameroon, 2349 Massachusetts Avenue, NW, Washington D.C. 20008, tel: (202) 265-8790, fax: (202) 387-3826. Overseas, inquiries should be made at the nearest Cameroonian embassy or consulate. See our Foreign Entry Requirements brochure for more information on Cameroon and other countries. Visit the Embassy of Cameroon’s web site at http://www.ambacam-usa.org/ for the most current visa information.