400k Pages - Best Way for SEO?

Hello.

I have a site with over 400k of pages.

Each page's keyword probably will not get a huge amount of traffic - however, lots of pages indexed and getting traffic together they will rank easy.

Whats the best and fastest way I can do SEO to drive traffic to all these pages? They are lots of city locations etc.

So for each one, SEO will be reasonably easy - but how do i do them all quickly and at once?

Thanks

i think you just promote main url and category url (doing basic seo)
not all of the pages.

Few web 2.0's for every keyword?
I don't know about automation, but I'm sure some will know more and suggest something like Senuke or something similar.

Do deep linking for all your pages then it gets rankings ,traffic.They are so many pages you have target each page very seriously not take it light.