I'd put a bookcase on the longer wall, but close to the corner, and then I'd put two reading chairs on either side. Floor lamp all the way in the corner, for light, and a small table in front of the bookcase, between the chairs, for a drink...

My vision is somewhere in the intersection of these various photos:

Bowen Island, New Construction · More Info

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(You could do this with one chair, but two allow it to be a chat spot too.)

All options pictured are good ones. I especially like photo #3 as it allows for books but saves on floor space.

You are welcome...and how lucky you are to be near the sea in NH, from a long time resident of Amherst NH.

I'm trying to understand that space .... is that the kitchen facing the fireplace? My first question would be, do you have a seating area somewhere off of the kitchen (if you're not going to use this space for a dining room)? Do you have bar stools off of what looks like a piece of your kitchen counter top? If you do, then fine. If you don't, then I would put a round table and chairs in that space (you need a table and chair type space somewhere). So if that's taken care of at the kitchen bar, then I would think about putting a chaise lounge there and then a seating area in front of the fireplace. Again, I just can't tell enough about what is behind it or on the other side of it to really give an opinion.