I don't know if this is the right board to post this one, but it has "Outdoors" in the title so here goes.
How does one go about pursuing a job at a National Park at the age of 30 with no experience?

I could tell you my life story, but basically up until recently I've been doing desk work and going to school to study a major that I didn't actually care about.
Then something major happened in my life and after getting out of the hospital, I basically sat at home doing nothing for a while until getting a job as a Lawn Technician. Where I learned that I actually hated being inside and staring at screens, and much preferred walking several miles carrying equipment everyday in the blistering heat or freezing cold.

pic not related. I just don't have many images saved on this computer.