As cc1013 said, I would also suggest going on the monorail and getting off at each resort.
At the Contemporary walk around the 4th floor. Thats where the Concourse Steakhouse and Chef Mickey's are. There are also a few shops and definately check out the balcony outside, the monorail goes right over head and you have a great few of MK and the GF to your left.
At GF, check out the beaches...breathtaking.
I don't really remember too much about Poly because I haven't been there since '94ish. But I do remember some nice architecture.
Also, as Sunee said, go to the Wilderness Lodge. It is amazing walking in there for the first time. They also have a pond (or bubbling spring thing lol) and a bridge in there...very nice.
Those would be the best ones to check out IMO. HAVE FUN!!!