This large stoic and modern Japanese bathing complex reminds me of the Comme Ca clothing chain here in Japan. The design has an emphasis on stone with two distinct bathing areas, one using mostly dark black stone, the other with a lighter sand stone motif. The men's and women's bath change periodically between the two. Both sides have a large gorgeously designed outdoor area with little paths, lots of natural plants and, of course, baths. It's more like being in a garden with baths than being in a bath that has a garden.
I often recommend this place to people wanting to have their first super sento experience, or for someone who wants a more upscale, quiet place. I find that Suzuran no Yu can be quite crowded on holidays and weekends making the experience much less relaxing, so it is best to avoid those days if possible. Also, it's location makes it quite hard to get to without a car.