Costa Rica in May or November hits the sweet spot. You get lush rainforests, warm Pacific beaches, and smaller crowds right as the seasons shift. It is the ideal time to catch wildlife in Manuel Antonio or hike near Arenal without paying peak winter prices.
A typical week-long trip runs about $2400 for flights, stays, and tours. If you want to spread that cost out without interest charges, you can use the Citi Simplicity® Credit Card. It offers 0% for 18 months on purchases and balance transfers from date of account opening, which breaks down to $133.33 per month.
A 0% interest intro window is a repayment deadline, not free money. If you still carry a balance after 18 months, regular interest rates apply to whatever balance remains.