SDSU is not the “party” school it once was many years ago. It is the 2nd most difficult admit for the Cal States behind Cal Poly SLO, so there are plenty of serious students attending.
Again, Pre-Med is an intention and not a major. Each CSU will have strengths in variety of majors, so you should compare curriculums of the intended majors you plan to apply.
Your goal is find a school where you have a good chance for a High GPA 3.7+, access to Medically related EC’s and good Pre-Med advising.