Warning: The scale of the model is nearly 1000000x bigger than 3D printing scale. Use the scale tool to scale it down. Certain features like the watchtower will not be sliced on small printers. This model is missing all trees and foliage.
This is a model taken from www.models-resource.com of Outset Island from Wind Waker http://www.models-resource.com/gamecube/legendofzeldathewindwaker/
I used the Microsoft Model Repair on the .obj file https://netfabb.azurewebsites.net/ and that seemed to do the trick. In Sketchup I added a big rectangle to the bottom as a foundation.
Next I'm thinking about converting a Mario Kart track for 3D Printing!
Stereolithography printers might do a better job printing the finer details but a worse job printing the big rectangle base.