Planning a trip to Japan means choosing what kind of experience you'd like to have while you're there- you can go full urban in big cities like Tokyo and Osaka, go see all the wonderful nature in Kyoto or hop around and combine the two.
Either way, if you're planning a trip to Japan you should check out this TopTenz article that reveals 10 Must-See Tourist Attractions in Japan so you'll know which way you want to go.
You could go visit the wonderfully relaxing "onsen ryokan" hot spring hotels all over the country and unwind, or get wild in the city and see the famed Akihabara and Harajuku districts in Tokyo.
If you're looking for something a bit different why not visit some of the last remaining feudal castles like Matsumoto Castle pictured at the top of the post? Add Maruoka Castle and Matsue Castle to your itinerary and you've got a feudal fairy tale trip in the making.
And if you're planning on visiting Japan with your kids, or you're just a kid at heart, then you may want to check out Tokyo DisneySea, which looks amazing and quite different than all the other Disney theme parks.