I found this link that might help
http://www.ess.calpoly.edu/_admiss/Pdf/Profile08.pdf
It shows that the agriculture and food science has the lowest average (3.61 GPA and a 1132 SAT) so that is your best bet.
Just a heads up, if you are applying just to get in and then transferring to a major like engineering/architecture, it will be very hard so you might end up stuck in a major you do not intend to be in.