re: Grand Cayman - Suggestions?

You'll be fine there, just take it easy on the driving. There's only a couple dual lane carriageways (what they call four lane divided highways). Make sure you drive all the way around the East End of GC, it's very scenic.

Don't park downtown (George Town) during business hours in reserved spots, that's a big deal to them and they'll ticket you.

The old jail museum was cool.

Have fun!