The second way to create a Site Map just involves a little substituting: switch the <webaddress> and the <DomainID> with the actual school information in the URL as depicted below:
http://<webaddress>/site/Default.aspx?PageType=15&SiteID=<DomainID>
All of the sites / subsites will be accessible for any site map; however, by putting the appropriate site ID pulls up that school as the home school. Meaning on each school site if you wanted to you would simply change the <domainID> to match that of the subsite. Again, keep in mind that you can get the subsites or even the district once you create a site map.