The bus system is decent in Seattle. It's no subway, but when you need to get somewhere, it does the job. Fares are reasonable, while passengers are colorful. There is a song by Blue Scholars called "Joe Metro" that paints a perfect portrait of what your experience will be like riding the bus in Seattle. Much of downtown is a ride-free zone, but if you're coming from school, you might have to raid the couch cushions for some coinage. There are bus passes available for students in the Student Union Building, but they go quickly, and it's a little bit of a hassle. Cabs are easily accessible but are pretty expensive and not recommended unless you're out past the time the buses stop running.
Seattle is committed to constantly improving public transportation, as well. Recently, they completed a new streetcar line which has greatly assisted the community and earned itself a reputation as the South Lake Union Trolley—or the S.L.U.T. There is also a new transit tunnel that goes beneath downtown and avoids irksome traffic, getting you to your destination in a jiffy! Most of the buses in the city are hybrid-diesel electric, which fits into Seattle's value of promoting environmentally-healthy and energy-wise transportation, and all have wheelchair lifts or ramps and can accommodate bicycles.