If you want to give your credit card some exercise, head out to Taikoo Hui in Tianhe. Why not take a stroll along the riverfront and watch the sunset while you're here? Splash some more cash at Grandview Mall, Tee Mall, and Zhongtian Shopping Mall.
You might want to head out to Baiyun Mountain for some fresh mountain air and a bird's-eye view of Guangzhou. Want to stretch your legs some more? Head to Yuexiu Park and Southern China Botanical Garden, both nearby.