I am not good at hand in English, sorry.
You wrote:
One other thing that is annoying me though, is I can't seem to find any hotels in Shinjuku
that are free during that period. I tried www.asiarooms.com and it keeps telling me they are free.
Does anyone know any other good websites that would allow me to book hotels cheaply?
I sometimes use this hotel, in Kobe, Osaka. There are this groups hotels in Tokyo.
Althogh it does not stands in Shinjuku, I think it might be available to stay for you in Ginza where stands near Tokyo station.
Nikko to Tokyo
1) If you arrive in Tokyo station by Shinkansen, it takes 9 minetes from Tokyo station to Ginza Itchome station.
(( Tokyo station )) ----- (JR Keihin Tohoku Negishi line to Sakuragi-cho 130 yen) 1min ----- ((Yurakucho station))
------ (Metro Yurakucho line to Shinkiba 160 yen)2min ----- (( Ginza-itchome))
1 min walk from gate 10 of Ginza Itchome station (available time is 7:00 - 22:00)
3 min walk from gate 9 of Ginza Itchome station (at early morning and late night)
or
(( Tokyo station )) ------ (Metro Marunouchi line to Ogikubo 160 yen) 3 min ------ ((Ginza station))
4 min walk from Ginza station to Hotel.
You can buy 1 day ticket by 600yen for metro Tokyo at Narita airport.
http://www.tokyometro.jp/e/open_ticket/index.html2) If you arrive in Asakusa station by Tobu line, it takes 9 minetes from Asakusa station to Higashi Ginza
station. 4 min walk from Higashi Ginza station to Hotel.
(( Asakusa station )) ------ (Toei Asakusa line to Nisimagome 210yen) 11min ------- ((Higashi Ginza station ))
( Hotel URL )
http://www.hotelmonterey.co.jp/ginza/eng/index.htmlI hope your trip with your parents in Japan will be great.