its to bad you’re not going during April, I will be there for the entire month of April lol but I will do some research one place i think you should visit is Tokyo Disney, and Tokyo Disney Sea if you get the chance I had a blast the last time I went and Nara Park for sure to see all the Deer and like the others said make sure to get the JR Rail pass it will save you a bunch of money! :) oh oh and Cat Island, and Namja Town….. LOL ill get back to you with more…. XD i apologize in advance you might get a huge message with like over 100 places XD