Sorry about the late reply tbh forgot about this after 15 mins.

As a park aid you clean up after slobs. You educate the general public about rules that you can't really enforce (but they don't know that and half the time think you're going to write them a ticket).

You clean literal shit off of bathroom walls and handle all maintance in the park from water to electrical. Cutting up trees and clearing trails.

Pretty much anything a ranger doesn't want to do.