I should advise you that one needn't be an urban planner or cultural historian to find this to be a fascinating community, remarkably unvisited by most residents in Los Angeles.
The study of Little Tokyo, the history of how it ame to be where it is, shaped by such disparate events as American racism and imperialism of the late 19th and early 20th centuries, natural disasters, and migrations of peoples to California; it's near total obliteration by the forced removal of the entire population to --depending on your preferrered terminology-- concentration camps or the more euphamistically named 'relocation centers' during the hysteria of the Second World War; the miraculous rebound of Little Tokyo in the post-war years even as its population and prominence within the Japanese-American community shrank; to its late 20th and early 21st century resurgence as a symbolic center for an ethnic community and a newfound urban oasis of cultured living to upscale young professionals that know little to nothing of Little Tokyo's legacy.
The community is the locus for a vibrant design community and artists, as well as urban planners and students of urban land use and ethnic or cultural history and landscapes. And then there's the food. If you're going to go exploring, ya gotta eat, and you might as well dive in and immerse yourself in the experience of Little Tokyo with your tummy, too.
In searching briefly for the photographs below that would illustrate, in brief, my Little Tokyo, I came upon a number of interesting sites worth checking out. In addition to the link on the header above, I would suggest checking out these sites: http://www.usc.edu/libraries/archives/la/la_landmarks_japanese.html, http://www.sfc.wide.ad.jp/~yuudra/NISEI-WEEK/History-E.html, http://trainedmonkey.com/, and http://www.tiburos.com/sharkbait/.