No, no one thinking of visiting Japan thinks, "I'm definitely hitting up Suwa". I mean, I was born and raised in Tokyo, lived there until I was 18 and I didn't know where Suwa was until a couple of weeks before we went.
Suwa is a small town in the Nagano Prefecture in Japan. They're known for their hot springs, although not as well known as Hakone. Again, it's not a tourist destination but my family and I loved that about it. If you're looking for a spot that's less traveled to, a quiet place with good Japanese food, enjoy nature and relax in hot springs, it's the perfect place.