Here are some ideas on places to walk around or museums to visit during your free time in Arthens:
<aside> π Monastiraki flea market
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Monastiraki is one of the oldest and busiest areas of the capital featuring rooftop bars, ancient sights and endless market shopping.
The Monastiraki metro station is situated right off the picturesque main square (you can also catch a glimpse of stunning views of the Acropolis from here).

Go shopping at the Monastiraki flea market, a series of tightly lined pedestrian lanes for the quintessential βI Love Greeceβ tourist trinkets or pop into shops filled with antiques, handmade jewelry and Greek handicrafts.
Opening hours: from 10am to 10pm, daily.
Getting there: Metro stop Monastiraki (blue line). Location: https://maps.app.goo.gl/6FkoB7xweLuMRqrR6
<aside> π Panathenaic Stadium (Kallimarmaro)
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The Panathenaic Stadium is a classical cultural and touristic monument of Greece and one of the most significant monuments not only for Athens, but for the whole Greece. Its rich history is directly connected to the Modern Olympic Games as from their revival in 1896 until the Athens Olympic Games in 2004. It is also the place from where the Olympic flame sets up its journey to the cities of the Olympic Games, both Winter, Summer and Youth. With an entrance ticket you can visit the tarmac and even do a mock race.

Address: Leof. Vasileos Konstantinou, Athina 116 35
Getting there: Syntagma Metro Station (Blue & Red Lines)
Opening Hours: Daily 8am - 7pm
March - October: 8am β 7pm (last ticket sold at 7pm)
November - February: 8am β 5pm (last ticket sold at 5pm)
Cost: β¬10.00
Book online: https://www.panathenaicstadium.gr/Default.aspx?tabid=84&language=en-US
Location: https://maps.app.goo.gl/gsr6BFrrfxRQew928
<aside> π The Acropolis Museum
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A beautiful museum with a collection that covers the Archaic period to the Roman one, but the emphasis is on the Acropolis of the 5th century BC. An architectural gem as well as it is Athens most recent museum. The museum reveals layers of history: ruins are visible in its floor, and, through floor-to-ceiling windows, the Acropolis is always visible above.

Address: 15 Dionysiou Areopagitou Str.
Getting There: Acropolis Metro Station (Red Line)
Opening Hours:
1 November - 31 March:
Monday β Thursday: 9am - 5pm (last admission: 4:30pm)
Friday: 9am - 10pm (last admission: 9:30 pm) Saturday β Sunday: 9am - 8pm (last admission: 7:30 pm)
1 April - 31 October
Monday: 8am - 4pm (last admission: 3:30pm)
Tuesday β Sunday: 8am - 8pm (last admission: 7:30pm)
Friday: 8am - 10pm (last admission: 9:30pm)
Closed: 1 January, Greek Orthodox Easter Sunday, 1 May, 25 and 26 December
On Good Friday, the Acropolis Museum opens 12pm - 6pm and on Easter Saturday 8am - 3pm
On August Full Moon & European Night of Museums, the Acropolis Museum operates until 12 midnight.
Free entry: 6 March (In Memory of Melina Mercouri), 25 March (Greek National Holiday), 18 May (International Museum Day), 28 October (Greek National Holiday)
Cost: β¬10.00
Book online: https://www.theacropolismuseum.gr/en