Two posts up today as wifi is stronger now we are in port. I have stayed on board today. Yesterday we were in Cartagena and the heat and humidity was awful. Climbed up to the top of this fort we were visiting and my chest tightened up and I had trouble breathing. Abandoned the tour when we were back at the bottom and took a taxi back to the ship where I keeled over. Am ok now but we are at Panama and the heat and humidity even worse so decided to stay in situ. The contrast between the gleaming new city and the old was immense but both were crowded, noisy and, to me, unbearably overwhelmimg. I was glad to get out of it.