I'm chuckling at the Days recommendation (only because it's right up the road from me and you don't normally see it on a national forum!

)
FYI both Big Daddy's (I think that's the ice cream place the poster was referring to near Maine Diner) and Congdon's Donuts are both in Wells, not Ogunquit. (Just a couple miles North on Rte 1., but just a heads up if you're at the townline and haven't hit them- that is why.)
Also- if need something for the teens to do some night, Saco has a movie theater (I think it's even IMAX) as well as a smaller-amusement park (Funtown) and water park (Splashtown). I believe both of those have discounted evening passes.