As we have seen in the gameplay videos for two of the islands when looking at the top down view in blue of the park we can see the border limits of where you can build and terraform. What I'm wondering is can you expand these boards to give you more room for a bigger park and is there more chunks of land within one island that are linked up by the monorail giving you a few small parks (in a way) on one island or does each island only have one area of whatever odd shape that you are given to build your park in?