I'm starting to plan my second trip to Japan, and am looking for some possible day trips from Tokyo. My trip will most likely be next April (I start planning early), in case the time of year makes any difference. It looks like Nikko and Kawagoe are easily done as day trips. What about Hakone or Matsumoto? Looks like it takes about 2:40 to get from Shinjuku to Matsumoto, so I'd be on a train for over 5 hours that day. Would the 5 hour round-trip be worth it, or is there enough to see in Matsumoto to make an overnight stay worthwhile? Getting from Shinjuku to Hakone seems much more reasonable at about 1:40 each way on the Odakyu line. Can anyone suggest any other day trips from Tokyo? (I spent a couple days in Kamakura when I went in 2008). Thanks!