Starting at 1000 SW Naito Parkway on the waterfront, you'll open the Explorial app, enter the 6-digit game code that you received by text and Viator chat message, and head into downtown. The tour is fully self-guided — no guide, no fixed start time, just your group and the city. Powell's City of Books devours a whole city block with a million volumes under one roof. Riddles browse the colour-coded rooms without getting lost — mostly. The Chinatown Gateway follows, five roofs and two bronze lions marking the historic district's entrance. Trivia bows respectfully. Then Portlandia leans down from the Portland Building — the second-largest hammered-copper statue in America after Lady Liberty, and far more publicity-shy. Around two hours of bridges, books and food-cart temptations. The leaderboard names Portland's finest — weirdness counts double.