I would say: It's too nice a day to stay inside/indoors. But: It's very nice of you to say that. CB
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Anonymousclunky and awkwardTrue. I would certainly not use that "of".
Nikola NovakMaybe they wish to ask if it's nice that a day stays inside (and perhaps a bit too nice - who knows what it's doing inside).Very clever. (There's one in every crowd.)