vesicles
Colonel
There was most obviously a desire for expansion. Part of the answer is that China since the Han did not erect an ethnocracy like the Macedonians. This made their conquests longer lasting, but of compareable smaller scale.
Hmmm, this would be the first time I've heard people claiming China being "small". How big was the entire Macedonian empire? One mistake you made was to use the current Chinese map and assume China had always been that big to begin with. Thus, they had not conquered much. The fact is China during Qin era was only about 1/4 of the size of what China is now. Only the most eastern portion of the modern China was considered to be Qin 2000 years ago.
Here you can find a map of Qin and compare it with the current China marked by the dotted line. Most of the yellow within the dotted line was conquered in Han dynasty.
Here is a map of Han dynasty. As you can see, Han dynasty almost doubled/tripled the size of China since Qin. The map also shows that Han dynasty pretty much conquered everything they thought was worth conquering: east -> all the way to the ocean; north -> near siberia (northeast) and to the edge of the big desert (due north); south -> to the ocean; west -> to the biggest mountain on the planet (Himalaya). Now, can you think of anything else to conquer if you were a Chinese and knew only what they knew back then?
I don't know about you, but that's BIG scale.
About central Asia, like Solarz said, Xin Jiang WAS and still is central Asian. The locals in Xin Jiang look Central Asian, speak the Central Asian language and believe the Central Asian religions. And it became part of China through conquests. Han sent multiple expeditions and conquered most of Xin Jiang as indicated by the map above. Unlike Europe which faces the fertile side of Central Asia, China neighbors with the desert side of Central Asia. So there was little motivation in conquering Central Asia except exterminating the annoying nomads and protecting the Silk Road, which was at the time of early Han was not as extensively developed as in Tang dynasty.
Interactive maps of Chinese dynasties.
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