Personal trivia that I believe I've mentioned on AZ before. My folks were from MA and though I never lived there, we returned every summer to visit relatives. Every summer for about a dozen years in my youth I spent a week at Hampton Beach, NH and have great memories of the area. Cold, but very clear water. I can blame my current problems with skin cancer on two things: my Irish ancestry and Hampton Beach sunburns
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I was a serious distance runner in HS and college and used to run up the coast along a seawall from Hampton to Rye and back for training runs on some of the visits. Beautiful.
We live 20 minutes from Hampton and make it over a handful of times a year. More in the off season than summer. Summer usually only for Casino Ballroom shows. While NH coastline is short, it has one of the best coastal drives I've been on in the Northeast. I can see how that was a fun place to train as a runner. I like the aesthetic of that old outdoor stage better than what exists today. Today's is nice, but the one pictured has almost a Frank Lloyd Wright look to it.
In addition to warmer water, another part of the reason I've always been more of a fresh water person is my complexion. My Irish skin prefers the more available shade at the lake. Also the lesser crowds. Lot of skin cancer in the older generations of my family. So, I am religious about sun screen and limiting exposure. That's harder to do at an ocean beach. Sorry to hear about your diagnosis. Hope your treatments go well!