Last question first - you get 5 water park/DisneyQuest/Pleasure Island/WWoS visits if you buy the Water Park Fun & More add-on to your base ticket. The rule of thumb from mousesavers.com is that this is a good deal if you will make at least 2 visits to BB/TL/DQ.
First question - I bet I'm going to miss something but here goes anyway:
AYCTE buffets outside the parks (all 1 TS credit): Cape May, Boma (my personal favorite), Chef Mickey's, 1900 Park Fare.
AYCTE 1-TS-credit family-style outside the parks: Trail's End, 'Ohana, Whispering Canyon.
All of these have breakfast and dinner; Trail's End and Whispering Canyon are the only ones that do lunch.