If you give yourself some time to research the options you will definitely be able to find independent operators offering excursions for the time you are in port. But as the post above said, it will be a little more hassle to arrange than to go with the planned excursions from the cruise – you may have to get yourself to a meeting point. But it can be worth it, especially when you are not thrilled by the excursions on offer from the cruise. Much better to plan something you really want to do rather than spend money on a trip for the sake of it. Plus, for a great experience in the city all you really need to do is walk and explore! Get a guidebook and find a good restaurant, or visit an interesting museum.