"I got something a little spicier than usual, Jimmy. Somebody I know needs a police bus. Don't say nothing to no one about this. He's going to drive it right into the pen to spring a buddy of his and it's all really hush-hush. Dangerous job, but it pays well."
This one's short and easy. Drive toward the Port and you'll find the bus sitting in the lot in front of the warehouses. Hop in and drive it to the garage in South Millville. Just keep in mind it makes wide corners and takes a fair distance to stop. However, there's no hurry so just take your time and when you get to the garage park under the rotating 'P' icon to end the mission.