Sue, One of my favorite things to do on St. Barts is go to St. Jean beach. There are lots of small restaurants along the beach where you can sit and watch the planes take off from the St. Bart's airport. What a treat--the airport runway goes down hill, so watching the planes is like watching some kind of thrill ride. (You can also see several small planes in the water that didn't quite make it).
Be careful if you are going to buy anything in St. Barts, though. We spent a few days there a while back and happened to be in one of the larger shops when a small cruise ship sailed across the horizon headed for a St. Barts stop. The shopowner immediately got his wife and they proceded to run around the shop raising all the prices. I was somewhat shocked to see that some of the price increases were almost double. Take note if there is more than one price sticker on an item and don't buy it--the price has probably just gone up a bunch.