Heck, you'd need at least 2 weeks to see a good part of Nova Scotia. As for seafood, it is offered everywhere, just stay away from the tourist trap restaurants.
I've not been down since 2000, but these few stops serve up good food. Of course, you just need to ask a local where's they'd be going to.
Halifax
Five Fisherman
Red Stag
Lunenberg
Savvy Sailor
Dartmouth
John's Lunch for scallops and chips