I spent 7 weeks in the Canadian Maritimes last summer (New Brunswick, Pei, Nova Scotia).
Nova Scotia highlights were Lunenburg, Peggy's Cove, Pictou, and Halifax. When in Halifax, stop by Murphy's on the Water - owner of Theodore Tugboat and give regards to Capt. Peter Murphy. Cabot Trail is a must do car trip. Baddek interesting.
PEI is also a must do. Try to do some of the provisioning by driving past local farms and buying the veges and fruits direct from the field, especially the famous PEI potatoes.
Thumbs up to all suggestions previously mentioned in this post.
Check on the rules for liquor on entry. I made for some very happy border inspectors.