I do not recommend the Taste of Cartagena. It's one of the most popular and they pack people in. Several different buses, all trying to go to the same places. There were crowds, guides talking over each other, etc.
Be aware that there are many street vendors that appear very aggressive. If you don't talk to them and just wave them off politely, they will still follow you around but they won't bother you. It's part of the culture as that's how many people make their living. They are everywhere. it didn't bother me too much, but it bothers some people a lot. Nothing Disney or anyone else can do about it. Be prepared.
I loved the history and the views but not the oppressive heat and humidity or the crowds. Would recommend almost anything else.