Because I am loving this game I watched many streams and videos on twitch and youtube.
Everyone does repairing/cleaning/building directly after the park is closed - when all workers are resting.
Then in the morning they directly OPEN the park.
But many parts of the park are still not repaired or cleaned, because the player are missing them.
During the day-open-time it becomes stressful because the staff is still doing the stuff from the day before AND is losing energy.
When the players are getting to 5 stars they are glad the stress is done, and they will never play again.
AFTER the TUTORIAL - when the FIRST staff member will be hired - there should be added an INFO (like the others):
After the park closed,
you should go directly to sleep and
do everything else in the next morning
- BEFORE you OPEN the park -
because the staff then is working (helping), too.