Costa Rica is a coffee producing country and that is what most people buy there. Aruba is probably the third most popular shopping port (after St Thomas and ST Martin).
Jewelry and electronics are big. Perfume, china (blue Delft from Holland) and all the typical Caribbean shopping stuff. Actually my wife prefers shopping in Aruba . You can shop at a much more liesurely pace and prices in stores like Little Switzerland, Columbian Emeralds etc. are the same as in the other islands.