Theme parks have had to make a tough decision recently with the changing landscape of risk due to the COVID-19 virus. All major regional parks that would typically be open in March have either closed or delayed their opening until the first weekend in April, for now. This move is consistent with other entertainment options, like sports, theaters, and conventions, that would put people together in large gatherings.
If you had plans to visit any park near or far from your home please check their website before heading out, you don't want to have a Wallyworld moment. This temporary effort to keep people spread out and not spread this virus will hopefully pay off with a quick return to normal operations and daily lives. However this still may affect parks with later opening dates too, as many job fairs and hiring events have been cancelled or postponed as well. Please be safe and listen to advice on when it is safe to gather and travel from local government.