You'll need a picture I.D. if you're a U.S. or Canadian citizen. Expect 1-hour delays at customs on the highways on holidays and at peak periods of the day. Plan a 5-hour trip. From Seattle drive I-5 to Canadian customs and follow Rte 99 to the signs to the Tsawassen ferry terminal. Scenic in good weather.
Seas can be choppy at times.
Convenient to DAO and UW campi. Check with the DAO people for the latest information. Flights in and out of Seattle use SeaTac airport, the main regional airport, which is 25 miles from campus. It is possible to make connections to many other flights, though layovers can be long. You should have proof of auto insurance, which most rental car companies will provide on short notice.