1) As far as the Dawn Beach area, the Westin Hotel has NOT re-opened, and the casino is not open. Captain Oliver's as has also not re-opened. Otherwise, I think pretty much everything in the area has re-opened. I was never a big fan of Dawn Beach regardless. If it were ME, I'd pick somewhere in Simpson Bay or a villa on another part of the island. As far as safety, my perception is that it is not any less safe than it ever has been. The island overall seems fairly busy right now.

2) Of course, there are hassles travelling ANYWHERE these days. Please read the official rules in this link and then post any questions. Link And you also have to test to return home to the US.

3) Depends on your definition of 'working ok'. The jetways are NOT operational, but overall the airport works.

4)As far as rental cars, my perception is that there is a bit shorter supply than there used to be, but you can certainly find rental cars without any problem.