Walking along the Tidal Basin when thousands of Yoshino cherry trees bloom is worth the crowds. The blossoms turn the shoreline pale pink for barely ten days in late March or early April, and the city wakes up after winter. You want to be on the water paths at sunrise before tour buses arrive.
Because half the country wants to see the same thing, prices climb fast. A four-day weekend for two easily runs about $1800 once you add up lodging, food, and getting there. Spreading that expense over time keeps it manageable, provided you nail down reservations early.
Remember that the 0% intro APR is a firm deadline, not free money. If you still owe anything when the 15 months ends, regular interest kicks in on whatever balance remains. Pay the $120.00 every single month so you finish at zero.