hello, i would like to help you, but i am new to this forum and do not know the rules on posting commercial links...
however, i recently did a similar trip and used a really great tour company. they were very warm and helpful and made everything a whole lot easier. the tours were professional and i had a great time seeing all the cool stuff down there. they even brought me to places i hadn't been thinking about before. anyways, if you'd like some help send me a private message and i can give you the link.

And let me know if you need anything else.

Cheers, and bundle up (it's COLD down there)!