My initial thought of this gesture was that I thought this was something that I should do; not to all of them but at least one.
It is always good that one shows appreciation to others plus I have been in their shoes before so I really know how it feels to be working under the hot sun. One can’t open your eyes and need to keep the park really clean.
This post is dedicated to all Park Services people, thank you for keeping the park clean and tidy for all to enjoy! *salute*