A Portland Walking Tour is one of the best ways to see a city! You can get a feel of what it’s like to live there, and can wander around or talk directly to your guide. You can’t always do that with other types of tours.
Most cities have a lot of different walking tour options, especially if the city is small and/or walkable. Because of the way city planners built Portland, Oregon, it is conducive to great tours! You can walk through most of downtown and see what you like without a car. I did not find a free option in Portland, but I saw that Portland Walking Tours had some good reviews and has been around for a while, so I chose to go with them.