I am from Singapore and will be going on a short vacation to Tokyo from 14th to 21st April 2013, I am aware that it is now spring and according to the weather forecast found on most sites, the temperature may vary between 21 to 10 degree celsius and may get a little chilly when night falls. I don't know how accurate the information is, hence I would need help if somebody can tell me if that is really going to be the temperature that I will experiencing when I am there. I am not very used to cold countries so I have no idea how cold the minimum temperature is going to feel like, would an overcoat be more appropriate or is it too thick? Also, I will be there with a friend, it is both our first time to Japan. We will be roaming around on our own. Is it going to be easy to get around while we are there? Please suggest some top picks places of attractions that we can visit. Thank you.