I spent several hours walking the island and deeply enjoying the height of a glorious NY summer. In previous map cutting exercises with islands in rivers I usually just left the entire island white to signify a lack of roads at the scale of the rest of the map. However, that seemed disingenuous to the experience of the island. So I attempted to finely trace the edges of the island and then a few of the paths to give a sense of it as an accessible space.
One of the primary difficulties I have when I am drawing my lines for cutting is the shoreline. There are several different ways to approach this. It gets complicated when roads run right up to the edge as they often do in large cities. In this photo you can see that the large sections of white represent area that has no road but is not the river. This is sometimes convenient when there are parks or beaches, but in a place like Manhattan or London the roads run alongside and I have to determine how much space to give to maintain the character of what I'm cutting. In this case it turned out quite well. However, I'm likely to cut it differently again the next time because I dislike the thin line at the shore. In other pieces I've made the river boundary thin or made the river solid. This is what I mean when I talk about experimenting with representation and why I like to return to my designs and try something new.