If you are talking about Cartegena, Colombia. it's one of my favorite ports, but I would definetely hire a driver. The vendors are very persistant..lol.. We haven't been back for a few years, but many, many moons ago spent a week there.. and the last time we were there was on a cruise ship..There is so much to see and so many vendors to say "mas tarde"..lol.. If you just want to wander the old city.. I shouldn't see any problem.. we were there just as they were building or restoring.. there are/were some lovely restaurants behind those big doors..