Hi, I will be traveling to Tokyo on May 7th for a week. Some time during that week, I'd like to go to sightseeing at Lake Suwa for a day. Will it be very hard to get a train ticket to there and back by the time I land at Narita? I will stay in Tokyo most of the time, so I don't take enough trains to make a JR pass is worth it.
Any help is appreciated. Thanks!