"Down-sampling" a pdf
I am new to Mac and have a 24 MB pdf that I need to make available on the web at a reasonable size. It was originally printed out at 300 dpi at 24 x 36 but I don't have access to InDesign (I used the demo). I have Pages and Acrobat Reader but I am not sure if I have Adobe Acrobat for the Mac.
Is there a way to "downsize" this document so that it does not take up so much space? I have tried saving as a jpg and a couple other file formats to no avail.
Thanks.
Mac OS X (10.6.3), Mac Pro, MacBook Pro