It’s true that Humboldt is isolated. But that’s not necessarily a bad thing.
One of the biggest complaints about the Cal State Universities is that most of them are “commuter schools”. The campuses are lively and bustling during the day, when classes are in session. But most of the students actually live elsewhere, and so they leave the campus area after their classes are over. This means that the campus atmosphere is pretty much dead in the evenings and on weekends, and that the social aspects of the college experience are lacking. You may find that CSUMB has a “commuter school” reputation.
A few Cal States, on the other hand, are known for a more traditional, residential college experience; these include Cal Poly SLO, Chico State, and Humboldt State. These campuses have much better social scenes, precisely because they are so isolated. Students don’t commute to Cal Poly or Chico or Humboldt, because they aren’t close to any major cities; this means that the campus area has just as many students in the evenings and on weekends as it does during the day. The students all live on campus or in town nearby, and the social scene is way better for that reason.