Sounds perfect!Most things are open...currently...albeit at a reduced schedule.
The only major thing shut is Skyrail.
Not every reef boat goes every day, they share the passengers and the trips.
So if you want a specific tour, you might end up on another similar one instead.
The crowds are down, only grey nomads to fight with at the moment.
Sadly I'll be working the majority of time but shall make time for excursions!