You'll enjoy the restaurants and museums in Gaziantep City Center. You might want to make time for a stop at Hisva Han or Naib Turkish Bath.
If you're spending some time in Sehitkamil, Gaziantep Zeugma Mosaic Museum and Forum Gaziantep are top sights worth seeing.
While visiting Oğuzeli, you might make a stop by sights like Sirehan Shopping Centre and Forum Gaziantep.