Why Sunday is a good day to travel
Sundays in Antalya have noticeably less commuter traffic. The D-400 coastal road is 20-30% lighter, the city ring road is 40% lighter, and Belek's resort circuit is 15-20% lighter. Translates to 5-10 minutes faster on most routes.
What's open on Sunday
All Antalya tourist services (hotels, restaurants, attractions, museums) — yes. Local Salı Pazarı (Tuesday open-air market) — closed obviously. Most independent shops — closed. International chain shops (mall, supermarket) — open. Antalya Bazaar — most stalls open.