Start early at Petřín Gardens, when the shaded paths are coolest and the rose gardens are still relatively quiet. From Malostranské náměstí, walk up through Újezd and follow the hillside paths; allow roughly 20–30 minutes for the climb, or check whether the Petřín funicular is operating that morning, as it is periodically closed for maintenance. Spend about two hours wandering rather than trying to cover every path—bring water, since the hill’s fountains are not always reliable. The gardens are free, while the funicular uses the regular Prague public-transport fare.
Continue to Petřín Lookout Tower, an easy walk from the upper gardens. It usually opens around 9:00, but confirm the day’s hours before setting out; admission is generally around 200–250 CZK for adults, with reduced family tickets available. The tower has a substantial staircase, though a lift may be available for an extra charge. On a hot day, enjoy the panorama, then linger under the trees rather than rushing onward.
Walk downhill toward Strahov Monastery in Hradčany, following the quieter paths and streets near Pohořelec; allow about 20 minutes. Visit the historic complex and its magnificent library halls for roughly an hour—library access is typically limited to viewing from the doorway, and the combined adult admission is usually around 180–220 CZK. The courtyards and surrounding viewpoints are free, so this makes a good pause before lunch. From the monastery, walk downhill through Nerudova toward Lokál U Bílé kuželky, about 20–25 minutes, or take tram 22 from Pohořelec toward Malostranské náměstí and walk the final few minutes. Reserve ahead if possible; expect 250–450 CZK per person for a main course, with hearty Czech food and well-kept beer.
After lunch, make the short walk to Charles Bridge and cross toward Old Town. Late afternoon is much more comfortable than midday, though the bridge remains busy; pause at the side overlooks for views of the Vltava and the Lesser Town rooftops. Allow about 45 minutes, longer if the family stops for artists, musicians, or the statues. Finish at the Kampa Museum courtyard and riverside, reached by turning back toward the Malá Strana end of the bridge. Focus on the outdoor sculptures and the gentle river walk rather than entering the museum; courtyard access is generally free, while museum galleries usually close in the early evening. For a warm September day, bring water and plan this final hour slowly—the riverside is cooler, and it is an easy place to end without adding another major attraction.
Leave Malá Strana around 8:00–8:15 for Prague Zoo in Troja. Walk to Malostranské náměstí, take tram 17 toward Kobylisy, then change near Výstaviště for bus 112; allow 35–50 minutes. A 90-minute PID ticket costs roughly 40 CZK and is the sensible choice for this outing. A taxi or Bolt takes about 20–30 minutes and usually costs around 350–550 CZK. Arrive close to opening—typically 9:00 in summer, though check the zoo’s September hours—so you can enjoy the shaded paths and outdoor habitats before the hottest part of the day. Allow about three hours, with comfortable shoes and water; the zoo is large and includes some hilly sections.
From the zoo, walk or take the short local connection to Troja Château gardens, where the formal terraces make a peaceful one-hour pause after the busy animal exhibits. Check garden access and château opening times before setting out, as they can vary by season. Then continue by public transport toward Letná—allow roughly 25–35 minutes, usually via Výstaviště—for two hours at the National Technical Museum. This is an excellent rainy-day fallback as well as a hot-weather escape, with memorable aviation, transport, astronomy, and engineering collections; reserve extra time for children in the large transport hall. Admission is generally in the low hundreds of CZK per adult, with reduced family and child rates. Late afternoon, walk uphill to Letná Beer Garden for a shaded drink and simple snacks, budgeting about 150–300 CZK per person, then stroll downhill or west through Stromovka. The park’s broad lawns, playgrounds, and tree-lined paths are ideal for letting children run free; allow 1–1½ hours and finish near Výstaviště, where you can easily pick up a tram or taxi back to your accommodation.