In our US libraries there are usually good selections of photograhic books of scenic tours of world places including New England. Perhaps your library has a selection like this for you to browse through. You can order pamphlets from each state that will tell you about their tourist spots, geographical highlights, etc. including coupons for places to stay and eat and have other information. Your best bet is from research on the area. You sound as if you probably know the location and history of the lighthouses now. I don't know how long you are staying but thank goodness New England is small because you are wanting to tour the coast and the inland areas. You will need good planning.
Best wishes to you on your marriage.