Google Maps

Fellow users of Rails,

I am working on an app that needs to allow people to create a camping location. They would need to add a placemarker via google maps to get a longitude/latitude. This is easy to store in two decimal fields. My problem is I am unsure what to use to generate directions for others to use, eg: "how to get to X from Y". Google Maps doesn't have the routing support available at this time.

Any input on plugins/links/tutorials/etc would be greatly appreciated.