or 3 ... makes no difference. You'll collect much more ionizing radiation on the way there than on the ground in NRT or HND.
There is NO problem with going to Tokyo just now.
You know the radiation values (if you know where to look - someone posted a link I believe)
And for the worst case scenario:
You know how far it is from Fukushima.
You know here the wind comes from.
The rest is maths.
And - I can only say it again - 200+ km from ground zero you will NOT turn into the Incredible Hulk, nor into Spiderman (if a Japanese spider bites you) ...