Ikebukuro.
Sunshine 60 - and the observation deck.
Akihabara.
Tokyo Sky Tree.
Tokyo Tower.
Roppongi Hills.
Tokyo Midtown.
Yurakuchou/Ginza.
L Tower Shinjuku Nikon Salon.
Bic Camera/Labi for electronics.
Visit a Gran Cyber Cafe and spend an hour there - or the night.