The government of Prince Edward Island provides some data, not quite Open-data, in the form of GIS shape-files, like SHP, SHX and DBF. Some of the data is free and others are provided at a cost and to download any of them requires you give your email. The website is here: http://www.gov.pe.ca/gis/ .
If you wish to convert these files into KML for use in Google Maps and Google Earth do this:
- download the free software, shp2kml.exe (at http://www.zonums.com/shp2kml.html)
2. download a dataset (a ZIP file containing several files) here: http://www.gov.pe.ca/gis/ and unpack the ZIP file
3. start the shp2kml.exe program, go into the folder where the ZIP was unpacked, select the SHP file and convert it to a KML (readable by Google Maps and Google Earth)
4. this KML file is 35 MB large because it is for the entire province.