Putting My Residents In Isolation in Animal Crossing New Horizons

I set out on my quest for the river landscape tool because I have big dreams. I want my island residents to all have their own little islands. All it takes to get it is 6000 Nook Miles. and this is easily done by me messing around. I try the stalk market, 5x Nook Miles bonuses and seeing things like the holidays, my birthday and shooting star events. This gives me a chance to see more of the game and make easy progress. Now I have both the cliff and river tool so I can really make a mess of my island. This