Flanked by the Sierra de Las Casas to the west and the Sierra de Caballos to the east, Nueva Gerona is a small, unhurried town that hugs the left bank of the Río Las Casas, the island's only large river. Little-visited and devoid of any the major historical buildings that dot Cuba's Isla Grande, it's a small, cheap and incredibly friendly place and you could easily find that you're the only foreign face around.