If your trip to Mertola is all locked in but your travel itinerary is a bit on the empty side, let us give you a few hints and tips.Not far from the heart of the city, Parque Natural do Vale do Guadiana is one spot you might like to consider putting on your must-see list. If you still have some room on that travel itinerary, Largo Luís de Camões and Castelo & Torre de Menagem will keep you on the go as well.