Montreal in late spring is hard to beat. The patios finally open up along Saint-Denis, the winter chill is gone, and you miss the heavy summer crowds while the city is at its best. Walking through Old Port and grabbing fresh bagels in the Mile End makes for an easy, rewarding long weekend.
A typical trip runs about $1200 for flights and a decent place to stay. You can pay for it all upfront, or you can use the Discover it® Cash Back card to spread the cost out over time if you want to keep some cash in your checking account.
Remember that the intro window is a strict deadline, not free money. If you still have a balance left when the 15 months are up, interest will kick in on what you owe.