Aww, Blackpool's fabulous!
Yes its brash and 'in your face' but in fairness it's never pretended to be otherwise.
As you're going during the day, you should avoid most of the stag/hen drinkers Eve, though be prepared to dodge large people and prams! Cafes are pretty much everywhere, including up the side streets going off from the front, you won't have far to go for a brew and a chip butty ;-)
I know you said you weren't a fan of donuts- but I am! Can you brin me some back with ya? Ta!