Kyoto in late March and early April is incredible, but everyone knows it. The pink blooms along the Philosopher's Path pull massive crowds, and prices spike quickly if you wait. Booking six months early gets you into that sweet spot for flights and stays before the rush hits.
A full trip from the US usually runs around $3200. Instead of taking a big hit to your savings all at once, you can stretch that cost over a longer period using a 0% interest card, as long as you pay it off before the promo ends.
Remember that a 0% promo window is a hard deadline, not free money. If you still have a balance when the 18 months end, regular interest kicks in on whatever is left, which makes the whole trip much more expensive.