I've never found daikon to be spicy, even raw. Catrin, it's mild and almost slightly sweet, so go ahead and try it. It's pretty good with dip too--almost like chips because it's crunchy, but not bad for you! It's also good raw with a sprinkling of soy sauce for salt.

Shootingstar, at least in this part of Ohio, and even in Cincinnati (a more diverse city), we can only reliably get bok choy and daikon (and that only semi-reliably). If I were to drive down to the GIANT international grocery store in Cincy (which is inconvenient even from my parents' house), I might be able to find a bit more.

Oak, I actually cooked radish greens this evening...albeit in bacon grease. Not bad, but I wouldn't go out of my way to eat them...