I agree with BrownParent, your choices are not the best. Majority of the Cal States are commuter schools, so only a few students remain on campus on weekends thus the party scene is limited. Also Cal States to do not have a large Greek system (Fraternities/Sororitites) where many parties happen.
San Marcos does have a train station on campus which would help with transportation:
https://www.csusm.edu/global/ugadmiss/index.html