Keep an eye out at Köy Pazarı — you're sure to discover some treasure or funny trinket in one of its many stalls. After you've admired the wares, enjoy a meal from one of the food vendors.
When you've spent some time at this Ayvalik City Center community marketplace, why not check out Sarimsakli Beach, Badavut Beach, and Devil's Feast? They're not too far from Köy Pazarı and also popular with tourists.