If you're looking for outdoor adventure, pay a visit to Jiangsu Yushan Mountain National Forest Park. No easy stroll around the block, this hike is great for some mid-vacation exercise.
When you've finished up at this Suzhou steep landmass, why not make your way to Changshu Museum, Wanda Plaza Changshu, and Shang Lake? They're not too far from Jiangsu Yushan Mountain National Forest Park and also a hit with many tourists.