Little icons and adding pictures help point out all your spots of interest, including the ceremony site, reception venue, and hotels and restaurants. Add comments to tell your guests about places to go and things to do while they're in town too.
You can choose to leave the link on your wedding website (which, by the way, you can also create your website on Weddingmapper.com too) or print it out for those that don't have computer or online access.
And to show you an example of a finished wedding map, here is our bride's for her fall wedding a few weeks ago:
Head over to Weddingmapper.com to check out all the other tools they offer too- forums, guest and vendor managers, inspiration, and more.