I did the same thing in 1987 - a one day sail trip to SBH. We rented a cab which is the best thing we could have done. After 10 or so vacations to SBH, it is not a place you want to rent a car for a day if you have never been.

My strong advice is to rent a cab to show you the island, as I assume that is the reason you are going - to see what it looks like. The roads can be a nightmare and finding your way around isn't easy.

I wrote off SBH after our last trip in 2007. The island was no longer the laid back place I fell in love with. However someone mentioned the creperie in Gustavia - it is a real gem.