It's been 40 years or so since I lived in Antigonish, N.S., so I hesitate recommending anything...but, I remember desolate, pristine beaches all along the coast from Antigonish to Cape Breton. And if they still exist, the sea-run brook trout ("salters", 5-10 lbs) were worth trying for.
Of course, well-known attractions like Peggy's Cove near Halifax, and the Cabot Trail on Cape Breton should not be missed.
The south coast is filled with quaint fishing villages.
Have fun, and watch out for moose on the Trans-Canada...they treat headlights aggressively!