Try Wilderness Lodge
Yacht/Beach are our favorites - the pool is by far the best (I haven't tried new pool at Poly -yet), Boardwalk is good too - our kids love the Keister Coaster water slide. With a 6 yr old (boy - I believe you said) - you just have to try the Wilderness Lodge. The hotel is great - transportation to MK is as easy as monorail from the Poly(there is a boat - direct to MK). There is a beach (no swimming - but you can certainly sit in the comfy beach chairs). The pool is cool and there is a hot tub. But the little guy will love the hotel. Much more interesting stuff to capture his attention - totem poles, a stream right through the lobby, and the list goes on... Not to mention, rates are generally lower at this resort and you don't really give up all that much Deluxe Resort quality (in fact I'm not sure what you do give up in that regard). Be sure to get a room with bunk beds - for some reason our kids thought that was too cool. Every afternoon at the pool there are organized water games - supervised by CMs. I don't believe you will be disappointed there. As for the Contemporary - there is a beach - but the pool leaves alot to be desired - just your basic Olympic size rectangular hole in the ground (with ice cold water of course).