When designing for a client who loves nature, and in a site with so much nature and featuring a waterfall, it feels impossible to ignore Frank Lloyd Wright's Fallingwater.
Although the building had many problems due to the waterfall (and Frank Lloyd Wrights refusal to use engineers!), it is still a beautiful design which still stands today (through reinforcing and underpinning). The clients for the building, the Kaufmanns, were big fans of the outdoors and loved to take part in outside activities. The building was designed to respond to this.
The ceilings in falling water are quite low to encourage people to move outside. All of the windows were all also located towards the front of the house and looked out towards the nature and the stone walls that can be seen from the outside make their way into the house to form a physical connection between the exterior and the interior.
This is a very impressive piece of architecture and one which is definitely relevant to my own project, I will be baring it in mind during my own designing. Below are some plans of Fallingwater.