If you get a chance, I'd recommend a visit to Manzanar internment camp near Mount Whitney, CA. They have retained a few of the original buildings converted into a fantastic museum, and have reconstructed one of the barracks to give you an idea of what camp life was like.

Conditions were certainly better than somewhere like Auschwitz- the Japanese were never put to death or experimented on medically. However, the camps were definitely very prison-like- beds in the reconstructed barracks that I saw consisted of a metal bedrame with a stuffed straw mattress, and the bathrooms, though segregated by gender, consisted of a number of toilets in very close proximity with no stalls to separate them. The interns were allowed a few luxuries that weren't afforded to your typical prisoner, though- for instance, a few interns constructed Japanese style gardens, complete with cement ponds and bridges. The ruins of these can still be seen at site.

The museum also mentioned Tule Lake camp farther north, and referenced the fact that conditions here were much more difficult than Manzanar. I've never visited it, though, so I don't have much to say about it.