Petřín is the city's green hill, the one you can see crowned with a small iron tower from half of Prague. The whole point is the height: a funicular up, a lookout that out-reaches the Eiffel by cheating with a hillside, and a slow green descent.
From Újezd, take the lanovka up — it runs on an ordinary transit ticket — or walk the orchard switchbacks if you'd rather earn it. At the top, the Petřínská rozhledna is the draw: climb it on a clear day and the mountains show on the skyline; on a grey one, save your legs. Next door, the mirror maze in its little castle is silly and worth ten minutes.
Come down past the rose garden by the observatory, then pick up the Hladová zeď, Charles IV's famine-era wall, and let it lead you down the slope. The walk ends hard and well, at the Memorial to the Victims of Communism on Újezd, where the trams are waiting.
