Snape was bored, and it was the holidays. He didn't have anything to do, but then one of his neighbours suggested that he take a road trip. After he had researched what a road trip was, Snape decided that he would take one. The only trouble was that it seemed to require a car, and Snape didn't have a car, nor could he drive, and he didn't have any friends who could drive, because he didn't have any friends.
Then he realised that he would have to learn to drive himself. So he went to the local Muggle driving school and signed up for driving lessons. Then he died. Then his ghost came back. With a vengeance. He then killed all driving instructors and cars. Then he double died. Because Hannah killed him with her erection.
The end.
Except it wasn't the end. Snape simply moved to another town and signed up for driving lessons there. (Nobody knew he was a ghost.) After several months of scary lessons, he became severely snapped and was declared to have a partial driver's licence. It was then that Snape knew he was ready to go on his much anticipated road trip. However, before he went, he had to pack his things.
He wasn't so sure what he should bring on a road trip, because he'd never been on one before. He decided it would be a good idea to pack at least the necessities for staying alive, namely food and alcohol. After conducting some research by watching several Muggle teen films, Snape learned that alcohol was absolutely necessary in order to have a good time on the trip. That, and friends. Snape couldn't buy friends, but he could buy alcohol, which he did. In copious amounts.
The last thing that Snape needed in order to conduct a road trip was, perhaps, the most important: a car. He had never bought a car before, preferring to travel by Floo Powder or Apparation. However, one of the great parts, he had learned, of a road trip, was the journey, not the destination. Additionally, a van could easily be fitted out with amenities that would render expensive accommodation unnecessary. Snape Apparated to a quiet alley just beside a car dealership and walked inside. He was immediately greeted by a fawning salesperson tripping over her own feet to please him. "Quiet," Snape said, "I wish to purchase a van."
Two hours and a large sum of money later, Snape drove out of the dealership in a mid-range van—automatic, gunmetal grey and boasting enough room to comfortably house one Severus Snape.
"Onwards!" Snape yelled to nobody particular, manoeuvring the van through the streets back to his home. It took him only half an hour to pack his bags, including enough groceries for a week. Last of all, he transformed the interior of the van into a comfortable studio apartment—a simple Undetectable Extension Charm. He wasn't sure where he was going to go, but Wales seemed appealing.