Sure, you could probably get by on English; my colleague "Skip" does, and doesn't seem to be very inclined (or able) to learn Finnish.

But you sure wouldn't really fit in; you'd be seen as either the Arrogant Americans, or a bit stupid... or both.

So I wouldn't recommend Finland unless you're willing and able to learn languages.

(But at least you could be sure the weathr isn't too hot! :-)