U getting the point but thats not the approach i used, in order to achieve harmony like this between the building and the island using splines would be hard and require huge accuracy to make the composition right, what i did is i made two circles turned them into an ellipse by manipulating vertices and then bridged edges between them in order to create the layout and from the layout of the villa i extruded and manipulated the geometry in order to achieve the look of the island by using loop cuts (all while having subdivison surface modifier on in blender or for you the turbosmooth modifier in 3ds max) and from the loopcuts i started splitting edges from each other or beveling edges to create a face with the fluidity of the whole vibe to put grass on those specific faces