I'm finally breaking down and buying a 2nd cartridge so I can make a themed dream town. I had a great idea for making a part of town only accessible once you find the axe/shovel, but I realized it might not work since you can't grow trees right next to each other. Is there any way (without hacking) to block an area off so that you can't walk through it without cutting down/digging things up? Would it work to grow a row of alternating trees and shrubs?