User: What are some ways of traveling from Washington D.C to San Francisco?
Assistant: - take a direct flight
- drive cross country on paved roads with a car
- drive cross country on dirt roads with a car
- ride cross country on dirt roads with a motorcycle
- ride cross country with a bicycle
- take a ship through the panama canal
- walk cross country
- take a bus
- take a train
- hitchhike 
- combine any of the following methods