we have done another cruise with the Brilliance in the Caribbean, but have also been in Aruba and Curacao.
You can do tours on your own or with a local driver, which is much less expensive then the tours, offered on the ship.
For example in Curacao there are standing some people from the touristboard and can give you some advices. We took a tour in a small bus and it was, when I remember well, about 14 $ per person. And we saw everything that was interesting on Curacao and at the end we could decide to step our in the center of the City or in the harbour.
And I´m sure you can do the same tour in Aruba.
By the way, a good place for buying jewelry in a family owned store, not in the big recommended stores.
Enjoy your cruise, Marita