Powell Books and Voodoo Donuts. Wrong time of year for some of the more outdoor attractions, but you could, if you have a car, take the Columbia River Gorge tour of waterfalls, they will all be in full splendor. Multnomah Falls, over 600' high is about a half-hour away on I84.
Oh, and Portland has the highest number of strip clubs per capita in the U.S.
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