You'll enjoy the museums and monuments in Chengxiang. You might want to make time for a stop at Yanshou Park or Jiulonggu Forest Park.
If you're spending some time in Hanjiang District, Putian Dongyue View is a top sight worth visiting.
If you're spending some time in Xiuyu District, Wenjia Wharf and Meizhou Mazu Statue are top sights worth seeing.