Before setting off on a driving vacation, you should:

Looking over the travel route and the layout of the final destination is crucial for ensuring a smooth and safe journey. Familiarizing yourself with the route enables you to anticipate any potential challenges, such as road construction, traffic patterns, and areas where you may need to take alternate paths. Knowing the layout of your final destination helps in navigating efficiently upon arrival, especially if it is in an unfamiliar area. This preparation can lead to reduced stress during travel and allows you to focus more on driving safely rather than figuring out directions on the go.

The other options may not enhance the driving experience or safety effectively. While having emergency numbers is practical, keeping them visible while driving could distract you from the road. Designating multiple drivers is beneficial for long trips but isn't essential for everyone, especially if you are not planning on switching drivers throughout the journey. Listening to specific types of music may enhance mood but does not contribute to the necessary preparation for a driving vacation, which focuses more on route knowledge and safety measures.