If I were in your shoes, I would go for the Polynesian. Since you are only there for a few days, I think this resort can quickly put you in the "vacation mood". While it's not the cheapest of the MK resorts, you have the best transportation options with the Monorail right at your front door, the TTC (Ferry Boat, MK monorail) within Walking Distance, as well as the shuttle boat from the Polynesian. This would be my number 1 choice in your situation.
If that's too much money for you to dish out, the Contemporary would be my second choice since you have the shuttle boat, monorail, and walking path all available to you. It's also cheaper than the Polynesian.
Thirdly, if that's still too much money, there is always Wilderness Lodge which can be a real bargain. Transporation here, however, can be rough, from what I've heard. You have the options of shuttle boat or bus, but neither are CONSISTANTLY reliable... you have about a 50% chance of getting lucky, from what I can gather.
Thanks my 2 Cents!! Hope you have a great trip!!
Jeff Walker