Sedona is all about red rock views, dusty trailheads, and cooler air when you hit the high desert. Spring and late autumn are the sweet spots for going, since the summer heat makes midday hikes miserable and winter nights drop close to freezing. You get crisp mornings, warm afternoons, and miles of sandstone trails that look completely different at golden hour.
A typical trip runs about $2000 once you factor in lodging, car rental, gear, and food. Spreading that cost out over a bit of time makes it hurt less, but you need a plan so you do not still owe for the red rocks long after you are back home.
That 0% intro window is a hard deadline, not free money. If you still have a balance left when the 18 months are up, interest kicks in on whatever you owe.