Sandcastle is MEDIUM poly 3D model, which means it can be used mostly for production and rarely for games. This small set also includes kids toys such as the bowl, the shovel and the rake; stone circle border and sand terrain.
I provide you 3 file formats: .max (2014), .obj+mtl, .fbx + .rar will all needed textures.
DM me if you face any problems or you need additional formats to be provided
-- polygons - 36.004; verts - 38.434 --
The map sizes vary from 1024x1024 to 4096x4096, but their resolution can be easily reduced fitting your requirements.
The sand terrain is created by using displacement map (don't forget to turn it on in max file).