In late winter 2016 I went to The Gambia, then Senegal, Guinea, Sierra Leone, Mali, Ivory Coast and Ghana. There where some difficulties, like the Ivory Coast / Guinea and Liberia land border closed (open now 2018), some shootings while staying in Bamako and terrible road conditions in Guinea. Western Africa is not a easy place.
It was a difficult start, I was in Berlin collecting different visa when I got on the 20.2.2016 a mail from my airline that my plane is now on the 22.2. instead of originally the 25.2. 2016. I just managed to rebook everything (except a Australian run hostel in Lyon).
I went for a few days to the beach in Serekunda staying at the Gambia YMCA, quite convinient, i case you come overland by car the Camping Sukuta & Lodge is the better choice. I i still had to get the visa for Sierra Leone (most visa i got quite fast in Berlin but the Sierra Leone embassy there was rather unfriendly, but qick and friendly in Gambia).