Looking for advice on what the ultimate day trip to St Barts would include.

We have only been there once, 2016 if my memory serves me. It was a spur of the moment decision. We flew out of Grand Case, rented a BMW convertible for around $100, drove around the island lost (phone nav didn't work), ended up at Eden Roc (we could have walked there from the airport), rented 2 chairs and an Umbrella for $120, ate an overpriced meal that was just okay and then flew back to Grand Case. We will be taking our best friends on our next trip and I would like to make it special. Will fly out of Grand Case, but everything else is undecided. Would love to find the perfect bar/restaurant on the perfect beach and see all the "must see" things in St Barts. Your help is greatly appreciated! Thank you in advance!