What I like most about the desktop UI for Fuji San Day Spa, are the out-of-focus photographs in combination with simple shapes. The colours, typography and navigation-elements form a unit, which works quite well with the one-page-design.
Forget the grid. Check out the richness of the colour palette. We've been addicted to grid layouts. It's nice to find good inspiration. These types of layouts are good for products, portfolios, and services.