Can anyone offer any advice re excursions - in particular Cassablanca, Oporto, Cadiz,Lisbon - we normally like to explore places under our own steam when we go on holiday - but this is our first cruise so wondered if it is really necessary to book on the ships excursions (which seem quite pricey)? Or is it possible to visit these places at our own speed. Any information would be appreciated. Thanks.
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