We docked at Cartagena on the Wonder on April 28, 2017. We had originally signed up for CT01, Best of Cartagena, but two weeks out, we were notified that the monastery wouldn't be available for our excursion, so we switched to CT23, Taste of Cartagena. It included a stop outside the fort for photos, then a 1.5 hour (not strenuous) walking tour inside the walled city, and finally (about) 1.5 hours of our own time inside the walled city before meeting our guide/bus to travel back to the ship. The excursion started early, 7:30AM, and lasted until about noon. We (two adults) had a wonderful experience!! The stop at the fort was short - about 15 minutes - and while there were locals milling about with things to sell, we were not approached by anyone. I'd read the locals would be pushy, but we didn't observe that anywhere during our excursion. The tour inside the historic area was informative and we greatly enjoyed the time we had on our own there afterwards even more. On our own, we explored the historic area with another couple, stopped at a café for coffee, shopped with street vendors, and stopped at another café for a beer. The locals were polite and friendly. The sun was definitely hot and it became more humid as the day went on, but not unbearable (although how bearable it was most likely depends on what climate you are used to... we didn't notice it being significantly different than Florida humidity in the summer.) We would visit Cartagena again without hesitation!