The Fort has been recently renovated in 2012. It has a museum with good information and exhibits. I took the guided tour which was very informative and cost about 10USD. It is easily accessible in the fishing village of Axim and has beautiful views out into the fishing bay. A must do if you are in the area.
Guide was pretty casual and asking for financial support. The tour could be so much more and presented more enthusiastically. The displays were interesting. Learning trip to Elmina (St. George's) might help as their guides are much better.