Thinking the Maritimes. Have???

We are short on time, so we need to hit what we can in a few days. We have narrowed our itinerary in Nova Scotia to primarily the area around Halifax. We are also thinking about Sherbrooke Village, Fort Anne & Port - Royal. For PEI, we are looking at Charlottetown & Cavendish mostly (LM Montgomery places). For New Brunswick, we are thinking the Roosevelt Campobello International Park & St Andrews nearby. From there, we would visit St John & Fundy Natl Park. Too bad our time is tight! Thanks...