If you have SimCity4 it's possible to load the .sc4 templates into it and add or remove streets. You should be able to create beach lot friendly neighborhoods. Then next time you create a custom neighborhood with that .sc4 file, you will have the changes made.
But as far as existing neighborhoods, there's no way to do it.
Thank you. I don`t have any of the Simscity games. I just think there are so much space left for nothing in the neighbourghood so it would be nice if more streets could be build. You have helped me many times. I appreciate that.
What exactly is Simscity?? What can you do with it?? Sorry, maybe this is too much to ask.