There are a lot of creative things you can do with shape-shifting; replace government leaders and rule over a country, shape-shift into a celebrity and reap the social benefits, maybe do some social experiments from a 3rd person perspective. Feel what's like to be Asian for a day or something.
The first thing I'd probably do is shape shift into Tupac and reveal myself to the public as if I came out of hiding. One of my friend's is a hardcore tupac conspiracy theorist, so I'd imagine Tupac coming back would bring him to tears.