Keep an eye out at Antico Mercato — you're bound to find some treasure or trinket among the stalls here. After you've had a good look at the wares, grab something to eat from one of the local food vendors.
This community marketplace in Ortigia is popular with many travelers, so leave a spot for it on your must-see list. However, your day doesn't end there. There are a lot more options waiting for you to appreciate after Antico Mercato. Cathedral of Syracuse, Temple of Apollo, and Castello Eurialo are not far away.