Concord will have lots of access to walking trails and nature. I just moved to Nashua and am blown away by all the nature and hiking trails within my county. You might have to drive a bit to get to good doctors, I’m honestly not sure. I do know that there are 2 really good hospitals in Nashua, and probably some good ones in Manchester too. I have several rare conditions, and so far I’ve found doctors in Nashua, Lowell, Mass, and Dover. People talk about how bad the food options are in NH, but honestly I’ve been pleasantly surprised. I’m a pescatarian, and plenty of places have vegetarian or vegan stuff, especially in Manchester. I don’t know about gluten free, and I don’t know about Concord, but my guess is you can at least find SOMETHING. There will be people to date/places to go out/a nightlife scene in Manchester. Concord is lovely but more sleepy. But they’re so close together. People will try to tell you that Manchester is sketchy, but that is only if you’ve never been to a city before. It’s not any different from any other small city. And btw, I don’t know Dover, but Portsmouth is beautiful, and Concord is a great little city. Sorry I wrote so much!