Regardless of whether the government's decision is right or wrong, I'm betting on Coz people going back to work on June 1, with staggered openings. I wouldn't be surprised if the marine park opens first week of June as well.
Are you really betting? Because the OP sure is. It's possible everything will go well and it will all fall into place but there are so many things to go wrong. I would never book a hotel six weeks in advance that is supposed to open the day before I get there. This in a country notorious for delays. Just why? What is gained? It's not like everything is going to be booked solid. I would not even want to book diving that far ahead when their boats won't be running for months.