Like other folks already told you, there are no programs that would allow you to redeem on Antarctica "cruise". Moreover, those "cruises" are not luxurious. Many of the ships are hastily redesigned Russia's-built research vessels, so Spartan would be more like it, and they sail through a very, very rough sea. What you could do, however, is redeem miles for flights to Ushuaia--the Argentine's southernmost city where most of those cruise lines sail from.