Skip New York, skip Santiago, skip Australia. Spend more time in Asia and South America, go and visit Africa, and go and visit India. New York is New York. Personally I don't like it there so I wouldnt go out of my way to go. I do have several friends there and the occasional reason to go but I usually try and get in and out. Santiago isn't all that interesting. Nice, though. Go to Buenos Aires instead. Australia would be nice but I think that if youre looking at a "world tour" then Africa might be more interesting. I suggest that when looking at where to go you consider the cost of going back. Personally, i would go to Easter Island Brazil and Argentina, wherever in Africa that strikes your fancy, Cairo and somewhere in eastern Europe (Budapest, Prague, Warsaw, etc.), Beijing and Hong Kong, Delhi, and wherever else in SE Asia that attracts your interest and fits your budget. Unfortunately youre a bit limited due to segments but with all the LCC's you can get around a bit easier than in the past.