Grand Cayman - Rum Point

On our sailing in December, one of the ports of call is Grand Cayman. I hear its a tender, and we arrive in Georgetown.

Our itinerary says 8:30 - 4:00

How feasible is it to go to Rum Point?

Ive looked at Ferry times (getting there is doable, but there isnt any times before 3:30, so that doesnt sound like a way back) Ive considered renting a car, but hear theres traffic And bus sounds the most flexible, but I also heard the reliance on that is risky.

Has anyone been able to go on their port day and make it back without close calls?