Well if you are looking for a big mall there is something like that in front of the ship,
but I have been there two times and there are a few recomendations:
1. Buy bannana ketchup, nice product
2. there is a tour that goes to their chocolate factory is a good choice and at the end you can buy cacao in the original form to make hot chocolate when you get back home.
3. Also there are a few tours that goes to the volcanic part of the island that I will recommend
my advise book a tour this is an interesting island...