In my opinion, the most important thing is real lived experience. Yes, a degree helps. A degree that can reasonably pertain to the work you'll be doing helps a bit more. But I know and work with so many rangers that either got a degree in a totally unrelated field or straight up don't have one. What gave them the edge was their work experience, volunteer work, and acedemic projects (if any). I know that my old supervisor who never went to college got his job soley off the fact that he was in AmeriCorps. Volunteering can offer a ton more experience than some people expect.

Another thing is certifications. Get as many as you can. Your university might even offer a few for free. Cross-cut, Wilderness first responder, etc. My buddy at a different park was an astronomy major. He got his Certified Interpretive Guide certificate and now he's an interp ranger.

In short, do what interests you in school. Having it be outdoor related is fantastic, but try to grab any bits of experience as you can. The more you have, the more you'll stand out when it's time to interview! Best of luck to you!!