The model is just adorable though, seriously. Tiny little trees, tiny little columns, tiny little paths and tiny little views. The wonderful thing about planning out the sim in prims is being able to actually move my camera down into it, and see exactly how a view will be from any given spot. Right now I'm playing with the pallet of colors and textures, but here is my plan so far:

The basic layout, clockwise from the top left: my store (temple), market, fairy grove (alternate event area), towers (homes), old courtyard (fishing area and sandbox) bonzai island (my sandbox), and out on its own grand little cliff is the event hall.
There are still little bits of wood in there, because obviously it's not finished. I have grander plans for the columns and architectural details, but this is just an idea of the style and size of each structure.
That border around the upper part of the island is going to be a huge stone wall, like a levee, which is just going to drop off to a sheer cliff. I especially like the enclosed, cozy feeling a very large island can get when it's walled in, considering that an open island can feel a bit vulnerable. I also like the excuse for a slope, without a mountain.
This is by no means a surefire "the island will look like this" plan, but so far I managed to cram in a lot of fun stuff and I've accomplished most of the goals that I wanted from it. Feel free to offer feedback and suggestions on things you want to make sure I don't miss :)