We've been to St. Thomas at least 6 times over the years and have done a few excursions, but this time was just a day to shop at the Havensight Mall at the port. You can usually find something in these stores for souvenirs.
Since this is the only island in the Caribbean with a railway, we decided to take this excursion. It is a very informative excursion, with lots of information about the sugar cane industry that was the main industry on the island years ago, information about the little towns/parishes that the train was rolling through, and beautiful views of the ocean on the other side of the island. On a clear day, you can see St. Maarten and St. Barts.
This is a fun and exciting excursion. You zip-line for a total of 7 platforms in the trees. The first platform is connected to a walkway at ground level, but when you look down, it's like 200' to the forest floor! The guys running the operation are very professional, and funny at the same time, but at no time do you feel that safety is being compromised. Highly recommend this.
Not a real train, but a trolley on rubber tires. Takes you through the Botanical Gardens, and through the narrow city streets. The guide was very informative, especially about the plants in the gardens. I think (he didn't really say it though) that he may have graduated at the Botanical College on the island. This is a very poor island, at least at this port. The locals have tents and tables set up near the pier selling their wares.
One of our favourite ports of the whole Caribbean. Partly because my wife has a favourite jewelery store (The Grande on Front St.), but also because we've been there at least 9 times in 15 years/14 cruises. All of the beaches are beautiful, the water is warm, and the people are friendly. Excursions we've done in the past are power rafting, ATV's, mountain biking, island tour (by bus with our granddaughter) and snorkling. Can't go too wrong on this island!