Self guided walking tours in Portland, Oregon. Follow these 24 expert designed self-guided walking tours to explore Portland on foot at your own pace. How it works: download the iOS app "GPSmyCity: Walks and Articles with Offline Maps" on iTunes App Store or the Android app "Portland Map and Walks" on Google Play. Each walk comes with a detailed walking tour map as well as the photos and background information for the included attractions. The app's navigation function will guide you from one attraction to the next. The app works offline so no data plan is needed when traveling abroad.