Chevvron,
Do you have a sweet tooth? Sugar cane, sugar cane and sugar cane.
Firstly, I haven't actually been there myself but it is the province associated in the main production of sugar cane in Argentina. Historically, you'll find the original Quilmes settlements... before the Spanish drove them out to Bs.As. (now at Quilmes... which coincidently used to be the biggest brewery in the world)... with Tucuman topography varying dramatically from mountains to the west and flatlands to the east. Friends say it is worth visiting.
To be honest wikipedia will certainly give you further flavour beyond just sugar!
Tucumán Province - Wikipedia, the free encyclopedia
Hope that helps.
Good luck.
MG