umm, there are many places to go and enjoy.. it all depends on how touristy/cookie cutter do you want to make your trip out to be.
Google is your friend
for a first timer, if you're going alone and do not have that great grasp of the language you might want to stay at those touristy places cos most people there will speak english. but, japanese are really friendly people and will try to assist you no matter what. try researching some things that seem interesting to YOU. don't have others decide your trip for you :P
just a warning, summer is insanely hot and humid
