São Paulo rewards a thin wallet: the biggest park, the best rooftops and half the museums charge nothing, and R$ 30 buys a serious meal. These three days stay under R$ 100 a day, moving on a single metro fare between free centro and cheap markets.
The 1.5 km² central park opens 05:00–24:00 with zero entry fee: jogging tracks, the Marquise skate slabs, free Wi-Fi and the Museu Afro Brasil inside it, which charges nothing on Saturdays. Bike rental from R$ 10 an hour.
The Benedictine monastery at Largo de Sao Bento is free to enter daily; the monks sing Gregorian chant at the 07:00 weekday and 10:00 Sunday mass under a gilded German-built nave. Their bakery sells pao de mel and sourdough from R$ 12.
Brazil's oldest art museum, in a stripped 1900 brick school beside Parque da Luz, holds 11,000 works of Brazilian art across skylit galleries. Entry is R$ 20 but free every Saturday, and the ticket also covers Pina Contemporanea next door.
A grass bank in Alto de Pinheiros where a few hundred people gather nightly for the sunset over the Pinheiros valley. No gate, no ticket, no closing time. Vendors circulate with canned beer near R$ 6 and drummers start once the sun drops.
The 1933 market hall lit by German stained glass costs nothing to walk into. The famous mortadella sandwich upstairs runs past R$ 70, so stay on the ground floor: coxinha at R$ 10, and fruit sellers who push free samples of jabuticaba and cupuacu.
Latin America's densest shopping street pulls 400,000 people on a Saturday. Ignore the arcades and eat the sidewalk: hot dogs completos at R$ 10, grilled corn at R$ 8, pressed sugarcane juice at R$ 6, all served from carts wedged between haberdashers.
The Japanese-Brazilian quarter around Rua Galvao Bueno. Saturdays and Sundays the street fair fills Praca Osvaldo Cruz with food stalls: yakisoba around R$ 20, pastel de camarao R$ 12, harumaki R$ 6 apiece, sold until roughly 19:00.
A 24-hour lanchonete under the Viaduto Nove de Julho serving the city's benchmark pernil sandwich: slow-roasted pork, mustard and vinaigrette in a French roll for about R$ 30. Office workers and night-shift drivers eat standing at the counter.
South America's first skyscraper, finished in 1929 with 30 floors and a penthouse the builder lived in. Free guided rooftop visits run Monday to Friday, 09:30–15:30, looking straight down the Vale do Anhangabau to the Se cathedral.
The 3.4 km elevated motorway shuts to cars every night from 20:00 and all day Sunday, turning into a free promenade at third-floor height. You walk level with apartment windows and murals painted specifically to be read from the deck.
A 1940s modernist cafe-terrace cantilevered over the Nove de Julho tunnel, with an unobstructed view across Bela Vista's rooftops. Entry is free, an espresso costs about R$ 10, and Sunday morning brings a small organic producers' market.
Paulo Mendes da Rocha's 13-floor cultural centre downtown, reached by a concrete ramp that spirals the full height. The rooftop deck is open to walk-ins free until 21:30, and the ground-floor comedoria plates a full meal for around R$ 20.