I want to export an InDesign document from CS4, as a pdf but I want the recipient of the pdf file to open it as "fit page" and not the 173% size that it defaults to. I used to remember but......
If you had CS5 or later, you could choose Export > Adobe PDF > Interactive, you could choose Fit Page. But you don't have that option in CS4.
You'll have to open up the PDF in Acrobat. In Acrobat, choose File > Properties > Initial View. Choose Page View options here. Save the PDF document. When reopened, it opens with the settings you chose.