There are many places to camp. Nine days is enough time to explore a bit but you will have to limit where you go.
Where do the nine days start and end?
Here is information from a previous post: "Just just came back from a 10 day adventure through out Nova Scotia. We camped for seven days up on the Island and did the Cabot Trail. In Baddeck there are two main camp grounds Baddeck Cabot Trail and Bras D Or Lakes. Both are about 6 km.'s West of Baddeck. We stayed at Baddeck Cabot Trail. Nice pool and VERY clean washrooms. My wife, the clean freak, gave them a 10 / 10. Only drawback is that it is not on the water. Bras D Or Lakes is on the water. We talked with people who were camped there and we wished we have stayed there do to scenery You must get up to Meat Cove if you can. See my review." tripadvisor.ca/ShowTopic-g499213-i11713-k569…
You will also be interested in camping in the Cape Breton Highlands National Park: www.pc.gc.ca/eng/voyage-travel/reserve.aspx