First thing I do is check on my subscribed threads. After that, I spend most my time in the new posts section. If there is a particular thread I am looking for, I will go to a certain topic but that is pretty rare.
Im normally in New Posts. I always check my threads and posts and then I lurk the NP's.
If I'm a bit bored, I might check out the Horse Pictures and the Critique section and I also read anything that catches my eye.