In addition to Sea-Tac airport (and taxi/limo or rental car), there are:
Commuter rail service from Tacoma to Seattle and back, with the majority of trains running to Seattle in the morning and to Tacoma in the evening.
A ferry to and from Vashon Island. (Don't plan on walking anywhere when you get to Vashon Island; you'll need a car to get anywhere worth seeing. Some people bike around the island, but be prepared for major hills.) You can continue to Seattle or Port Orchard by crossing the island to the other ferry.
Amtrak Cascades trains running between Vancouver, British Columbia (Canada) and Eugene, Oregon, stopping in Tacoma. (Amtrak also has trains that go to California and to points east, from Tacoma.)
Sound Transit buses from Seattle, SeaTac, and Lakewood
Intercity Transit buses from Olympia
The Most Frequently Asked Travel Questions about Tacoma
Where To Stay & Best Hotels in Tacoma - updated Apr 2024
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Tacoma Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.