I totally agree with the first 3, but Megaton you get to at the beginning of the game so its not that special - and Paradise Falls was pretty weak IMO. It was just so easy to go through and slaughter everyone.
I'd say dont miss out on either the Oasis (top-center area of the map) or the Bethesda ruins - to explore the offices are pretty cool. Or even the Washington Monument is pretty sweet.
Uncharted Drake's Fortune
26/03/2009 / Now Playing... "Resident Evil 5"