Sandcastle is a 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; the stone circle border and sand terrain.
I provide you with 3 file formats: .max (2014), .obj+mtl, .fbx + .rar will all the necessary textures.
-- 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).
Contact me if you encounter any problems or you struggle with understanding how something should work, I'll do my best to help you :)
Happy renders!