Yep, it looks like a pretty good rate with your pin! Do you know what the special is for? Is it a % off room rate?
Our party of 6 (we have 2 adults, 1 'big kid', 2 kids, 1 baby... so 2 fewer adults & 1 more kid than you) in a family suite for the same length of time is $3500. We do park hoppers, so that is about $250 extra for us. The big price difference between your ressie & mine is the cost of the park tics for the 'adults' vs. 'kids' on the two ressies.