–noun => noun
1. something that provides mirth or amusement: A picnic would be fun.
2. enjoyment or playfulness: She's full of fun.
–verb =>verb (used without object), verb (used with object)
3. Informal . joke; kid.
(It was errors because the environment of the explorer.)
In the Dictionary.com link I gave you -- http://dictionary.reference.com/browse/fun -- it shows that "fun" can serve either as an adjective or a noun, yes.
In your sentence, I believe it's an adjective -- a predicate adjective, actually, since it is describing "dancing" from the other side of the linking verb.
To see what I mean, I'll write some other sentences which have OTHER adjectives in the predicate nominative position:
Dancing is good for you.
Dancing is tiresome.
Dancing is healthful.
You can scroll down a bit and read about predicate adjectives here.
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