You can't visit Prague without sampling their beer. It's honestly such a HUGE part of their culture and cuisine. Every bar has their unique home brew as well as hundreds of other local varieties.
Omotesando Hills are located right beside Harajuku, and despite their proximity, they could not be more different. Harajuku is where you'll find alternative fashion for the experimental youth of Tokyo while Omotesando is where you'll find an elegant fashion, shopping and entertainment neighbourhood. The tree-lined boulevards of Omotesando often remind people of the Champs-Élysées in Paris.