Japanese, with Thai coming in second but I like a lot of different types of food too, like Italian, Vietnamese, Greek, middle eastern, Chinese, Pakistani, French, American, etc... The only cuisine as a whole I can say I don't generally like is Mexican. I just don't like a lot of the common ingredients in it.
I don't like spicy food, or maybe I should say my palate doesn't like things that burn it. However it is easy to find dishes in most cuisines that are not spicy. A lot of people think all Thai food is spicy but you just have to look at the ingredients, not everything authentic is spicy.