Munich during Oktoberfest is a loud, joyful blur of blue-and-white tents and heavy glass mugs. If the crowds aren't your thing, go in May for the same alpine views and beer gardens without the massive lines. Either way, you will want time for the fairytale castles like Neuschwanstein, which looks exactly like the one in the Disney logo.
A trip like this usually runs about $3400. Instead of dropping that all at once, we use a specific card window to break it up. You pay for the flights and hotels now and settle the bill in smaller chunks over a year and a half.
The 18-month window is a firm deadline, not a gift. If you still have a balance when that period ends, the standard interest rate will apply to whatever is left, which quickly adds to the cost of your trip.