Aruba gives you calm turquoise water, steady trade winds, and almost guaranteed sunshine. Going between April and August hits the sweet spot: the winter crowds have cleared out, rates drop, and because the island sits safely below the hurricane belt, the weather stays dependable all summer.
A typical flight from the US costs about $470. Instead of taking the hit all at once, you can spread that cost over time without racking up interest charges.
Remember that a 0% interest window is a payment schedule, not free money. If you have a remaining balance when the 18 months run out, standard variable interest applies to whatever is left.