To visit the park, either hit the beach or work on Tanya and Elsa routes.where is the park can't find the park anywhere.
Once you have done their story lines through the task of visiting Elsa at home, the syringe will appear over the park and it will be selectable from the map.
The soonest it becomes available in tasks is around Day 74 with an event that triggers in the mansion lobby in the evening. Until that event triggers (someone in a yellow outfit), work on other tasks if they are scheduled previous to Day 74.
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