Colombia in those months is dry season across most of the country, with Andean cities like Medellín and Bogotá sitting in the 60s and 70s Fahrenheit and the Caribbean coast warm and humid. You get coffee region hikes, salsa nights in Cali, and old-town wanders in Cartagena without the April-to-November rain interrupting plans. A typical US traveler budgets roughly $560 for the core trip costs once the international flight is set aside.
That number is small enough to put on a card and forget about for a while, which is where a long 0% intro period can come in handy. The trick is treating the window as a deadline, not a gift, because anything left over at the end starts collecting interest.
The 15-month intro window is a deadline, not free money. If any of the $560 is still on the balance when month 15 ends, that leftover starts accruing interest at the card's regular APR, and the monthly payment that looked easy can climb fast. The plan only works if the trip is paid off inside the window.