In the interior there is a beautiful Botanical Garden with more fauna information than most similar places across the planet.
2nd most popular attraction in Barbados after Oistins Fish Fry. Underground cave with stalactites, stalagmites, small waterfalls and pools. Ride by tram through the cave; you can disembark at some points.
Mount Gay Rum Distillery Ltd.
The tour takes about 45 minutes and includes a rum tasting. There is a bar in a veranda. There are more expensive B$75 lunch tours which include transportation as well as food.