X2 on Cape Breton Island. We spent a few days there, overnighting at the Dingwall Hideaway Campground and Oyster Market near the top. There was a very low priced whale watching boat nearby (Oshan) which we enjoyed late one afternoon. We also stayed down at Baddeck near the excellent Alexander Graham Bell Museum.
Louisbourg Fortress on the island is worth a day to explore if the weather is good. A Colonial Williamsburg-type recreation with costumed interpreters, even little kids, farm animals, bakers, blacksmiths, pub serving foods of the era on pewter. Get there early as lines will form at check-in. Also drive over to the lighthouse which is part of the historic site. First lighthouse site in Canada.
We enjoyed a couple of days in Halifax to see the Titanic cemetery and Maritime Museum exhibits. Shubie Park campground is in the metro area.
Peggy's Cove and Lunenberg south of Halifax make a nice day trip.
We found Nova Scotia to be very welcoming to visitors with lots of good campgrounds, and will no doubt return soon to see more of the province..