Great article helps find what locations look like today
Hamilton College - the location for filming, and the alma mater of novelist John Nichols - has this page:
http://www.hamilton.edu/magazine/winter09/when-hollywood-came-to-the-hill
By using Google Maps, you can track down all of the locations, visually. I even found the spot where "Pookie" was dropped off, early in the film - barely changed at all! (South end of the circle at Vernon Center - Hwy 26. You can also find the cemetery - Skyline Drive - Kirkland Prospect Hill, I believe).
The Sylvan Beach Sunset Cottages have a web site, as well.
I have not been able to locate the opening scene location, however.