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as far as
DDP tips... well, I just use it as I see fit. I grab snacks when I'm additionally hungry, so I'm not much of a help - my favorite snack is the Mickey bar and a bottle of Sprite. (ok so it's two snacks but still).
For food... well, I do like when places let you get alternate drinks. I have only gotten a smoothie at Concourse and a milkshake at Sci-Fi, though. The plan keeps me too full, haha. I did just see pictures of some people's specialty drinks at Kona (included) and they looked g-o-o-d.
My favorite CS is anywhere DF can get a burger and I can get, not a burger. Best CS for us is Backlot Express in MGM, as I love the selections, and it's got that double cheeseburger. Sunshine Seasons in Epcot has a ton of selections, too, and has non-prepackaged desserts, too! Most CS's are the same kinds of food so there's no tips, IMHO, for most of those. Just what you like vs what you don't.
I think the "value" for the money is already there. You are getting much, much more than you paid for the plan. Eat what you like, and you'll be happy!