VISITING ADELAIDE! Where should i go?

[qingxiang]

HI!
I 'll have 1 week to visit Aus  in  this July, After landing AUs from New Casttle, i will take  a trip to visit Melbourne to meet my friends, then Sydney. It takes me 4 or 5 days  to stay there.  2 days leave, i wanna  come  Adelaide . In fact, i wanna to visit my friend if i have chance to meet him, but if not, where should i go for 2 days, which is the most famous place in Adelaide that i  should visit?   pls give me ur advice, thanks!
sir tom cowie!