The easiest way to do a San Juans whale watching trip without access to a car is to take the Victoria Clipper. Clipper Vacations offers a one-day whale-watching excursion out of downtown Seattle's waterfront, including time for lunch on San Juan Island's Friday Harbor. The Kenmore Air floatplane/whale-watching trips from Seattle are a popular choice, too – it's more expensive, but the extra money might be worth it if you've never experienced a floatplane.