Being a former Maritimer I love going down east. Unfortunately I generally just pass through NB on my way to Nova Scotia ...where I'm from originally. I use to see more of the province before they put the "new" highway in ... I'm dating myself I guess. I do have family in Fredericton and have stopped there for a day or two.
St. Martins looks like a great area to add to my "to visit" list when I do my Maritime Provinces and Newfoundland trip. I plan to be gone for 4-6 months when I do that tripp. I did cross over last year and popped over to St. Andrew By the Sea and spent the day there. Been there before and love the area. Some great picture taking opportunities as well.
I know that NB has numerous covered bridges as well ... and that is one of my favourite picture taking opportunities.