Because guests have inflated views on what seasonal parks' opening days are when the reality is most of the staff is either newly trained or a few months out of practice, systems are getting the kinks out, and it creates a perfect storm.   Even for parks that are opening big new rides.  There are a TON of better days to go. When I go to KI's in a few weeks, its more to get back to the park and enjoy it slowly, not to go all ride warrior (that's for mid-May or early June for me at the earliest). 

Why do parks in general have so much trouble opening day... https://local21news.com/news/local/active-police-incident-at-hersheypark-confirmed-by-dispatch-eyewitnesses-describe-scene?fbclid=IwY2xjawQ9aJhleHRuA2FlbQIxMABicmlkETFEd3RRbExmRkp0MGJHUHc0c3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHvl7LzfYirrD0sx33hqBP5G-L0wTmOfkwNtQ8HkAxYs9KbYS6ADiwnw-ZHBC_aem_h4ga6IXkLl1hrC4rlaxzvw https://www.facebook.com/share/p/1bbq3SNGRP/    

It is jazz....but it's the Phineas and Ferb theme song.

Of course they cut down the trees around the entrance   This chain is incapable of building anything new and preserving the trees.     KI continues to have less trees every season.    

Hopefully to a new better soundtrack. I swear if the jazz returns for a 5th time....