Cartagena has to be one of the cooler places I've been to. The city has been around for centuries and has perhaps the narrowest streets that I've ever walked.
The group of us stayed in an incredible house that literally had a pool of water running through it. You actually had to step on marble stones to walk from the front door towards the kitchen area.
We took a few adventures around the town and pretty much kept ourselves drunk around the clock.
Also, it turns out that Avianca is one of the best airlines I've ever had the pleasure of flying with.