Shoulder season is the sweet spot for a family trip if you can dodge school breaks. Flights are cheaper, resorts are quieter, and kids under ten do not care that the buffet has fewer options. The real trick is lead time: the stuff with limited capacity goes first, and the flexible stuff can wait for a sale.
The Citi Simplicity® Credit Card has a 0% intro period on purchases for 18 months from account opening. That gives you a fixed runway to spread the bill, but only if the timing lines up with when you actually book. So the plan below is mostly about sequencing, not finance jargon.
The 18-month intro period is a deadline, not a discount. If $1,000 is still on the balance when month 19 hits, that $1,000 starts growing at the card's standard rate, and the monthly math stops being friendly. Pay it off inside the window or get very close, and the plan works. Carry a balance past the deadline and it quietly becomes one of the more expensive trips you ever took.