Early December brings warm breezes and fewer crowds before the holiday rush, while mid January offers a great escape from winter with comfortable weather in the mid-70s. Driving down the Overseas Highway past endless blue water sets the tone for a slow, easy trip where you can spend your days on the water and your evenings eating fresh fish.
A typical trip runs around $2800 for flights, a place to stay, and a few good meals. Breaking that cost down over time makes it much easier to handle without wiping out your savings all at once.
Keep in mind that 0% interest doesn't mean free money, and that intro window is a hard deadline. If you still have a balance left when the 18 months are up, you will get hit with interest on whatever is left over.