If there is one place that you need to visit in Akihabara then that would be Hobby Tengoku - the Volks store located right outside Akihabara station.
Its filled with all of your hobby needs including Gundam's, Dolls, Figures and anime merchandise.
To get to Hobby Tengoku, just get off at Akihabara station Electric Town exit - but turn right after the ticket barriers and walk towards the main Chuo Dori street - you will see Hobby Tengoku on the right.
Volk's Hobby Tengoku in Akihabara is comprised of 3 floors - 1st floor contains anime/otaku souvenir, 2nd floor has figures/plastic models and 3rd floor features doll and doll related products.
Moe-Russian roulette cookies - like in the game of Russian roulette, 2 out of 12 cookies are very hot n spicy. Serious otaku will go for the ones the left in which 10 of the 12 cookies are extremely spicy.
Idol festival corner - for fans of idol training games such as Idolm@ster and Aikatsu.