Hawaii is by far the best spot. Problem is, almost always the first one of the era takes it
How? You can still attack it from the west coast.
I always hated hawaii.
It really is a terrible location. You can't get to anyone until you have a training base. Before that you can only boost and use stuff you're alliance gets. (Making you weaker in the long run)
That's why whomever starts on Hawaii almost never finishes there. They end conquered. and in the middle of nowhere.