Which sentence is more formal?

 - The cruise will begin in Florida and will make stops in Puerto Rico, Dominica, and the Bahamas.
 - The cruise will begin in Florida, and it'll make stops in Puerto Rico, Dominica, and the Bahamas.
The second sentence is less formal. You can tell because it uses a contraction (it'll).
The first sentence does not use a contraction, so it is more formal.