Nashville is all about live music spilling onto Broadway, late nights at historic honky tonks, and plates of fiery hot chicken that will clear your sinuses. Going mid-week instead of Friday through Sunday makes a huge difference. Hotel rates drop sharply, the crowds thin out, and you can actually get a seat at the best bars.
A typical trip runs about $1200 for flights, a mid-tier hotel, and food. Spreading that cost out over time makes it easier to swallow. You just need a clear plan so you are not paying interest on a trip you took months ago.
Remember that the intro window is a hard deadline, not free money. If you still have a remaining balance when those 18 months are up, deferred interest or standard rates will kick in fast, so make sure the trip is fully paid off before the clock runs out.