Where are good places for 3 young australians to travel overseas in europe/north america?

gday we're a coupla young aussie sheilas. we'll be heading off in 2010 on our good old flying kangaroos. we're off to the big smoke but by jingoes,we're just not 100% sure where we're going to go yet. we'll be gone for a year. any answers will be appreciated, and taken into consideration.cheers mate