North Pole

Icebreaker from Murmansk… fly off the ship by helicopter each day for sightseeing… at North Pole drink champagne on the ice if feasible… sail back to Murmansk.
Two weeks.
N.B. this is not a private group, there are usually others on board the icebreaker (although for a price…).

Antarctic

Fly from Punta Arenas to King George island… cruise in small expedition ship… uncrowded shore excursions…
8 days in another world.