The city itself is a walled old town on a cliff above the sea with waterfalls inside its own limits; almost everything else worth a day is a Roman or Lycian site within an hour or two by road.
Kaleiçi and Hadrian's Gate
The walled old town, entered through the three-arched marble gate built for Hadrian's visit in AD 130. Walking it is free and it is small enough for a morning, with the tram stopping at Kale Kapısı just outside the walls.
Düden Waterfalls
Two separate falls with the same name. Upper Düden, about 10 km north of the centre, drops into a gorge with a path running behind the curtain of water; Lower Düden falls straight off the cliff into the sea at Lara and is seen from the clifftop park or a boat. City buses reach both.
Aspendos
The Roman theatre near Serik, about 45 km east, still has its stage building standing to full height, which almost no other ancient theatre does. There is no direct public transport from Antalya, so it is a dolmuş from Serik, a tour, or a hire car; the aqueduct nearby is worth the extra half hour.
Termessos
A mountain city 34 km northwest inside Güllük Dağı national park, reached by a steep half-hour climb from the car park. It was never taken by Alexander and is largely unexcavated, so you walk through collapsed buildings rather than a cleared site. There is no shade and no water on the hill.
Olympos and the Chimaera flames
About 80 km southwest near Çıralı: natural gas vents that have burned on the hillside for millennia, best seen after dark and about a 30-minute uphill walk from the car park. The ruins of Olympos sit in the valley below, next to the beach, on a separate ticket.