Starting at Avenida Valbom 1 in the town centre, you'll open the Explorial app, enter the 6-digit game code that you received by text and Viator chat message, and drift toward the Atlantic. The tour is fully self-guided — no guide, no fixed start time, just your group and the city. The Marina de Cascais opens the route with 650 berths of gleaming boats beside the old citadel. Riddles navigate between fishermen's roots and regatta money. Praia de Santa Marta follows — a pocket beach beneath the blue-striped lighthouse and the Condes de Castro Guimarães palace, made for the photo task. Then the Palacete Seixas recalls the era when exiled royalty and Bond's creator loitered on this coastline in style. Around two hours of ocean air and cobbles. The final leaderboard is served like everything in Cascais — with a sea view.