Let the castle visit stand on its own
Elmina Castle belongs to Ghana's UNESCO-listed coastal forts and castles. Give its history a proper place in the day before deciding what else to do. A visit connected with enslavement shouldn't be rushed to make room for a packed afternoon.
Keep a break afterwards. Different people may want to talk, sit or spend some time alone.
Approach the waterfront with care
A walk around the Benya Lagoon area can add a different view of Elmina, but it is a working setting. Stay clear of people handling goods or equipment, and ask before making close photographs. Consider a local guide if you want more than a visual impression.
Don't assume that an active waterfront is a visitor attraction with a fixed route and facilities. Choose a clear meeting point before the group spreads out.
Choose one additional stop
Fort St Jago or another local visit may fit your interests, subject to current access. Pick one instead of treating every nearby pin as compulsory.
Start with Elmina Castle, then add the Benya Lagoon area as a flexible walk. Staying in the area can make that slower approach easier than trying to fit everything between long transfers.