Zonkie, about the only thing you can do in the stock game is zoom in (with the mousewheel).
The buildings and units are beautifully done, though, and it's well worth it to just follow around an army or two at the individual province level.
It would be nice in a future update (or Sengoku II) if you could toggle the sprites to be larger in the options menu, or have a hotkey on the keyboard. The default worldview misses out on a lot of the very impressive artwork on the map in the game.