〜な・〜なあ (feeling)
how …!, I wish (musing)
Plain form + な / なあ
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At the end of a sentence, な or なあ expresses a feeling, often half to yourself: いいなあ, "lucky you" or "how nice"; 今日は暑いなあ, "it's so hot today".
It's like ね, but more inward. ね looks for the listener's agreement; なあ is musing, admiring or envying. With たい, it's a wish: 海に行きたいなあ, "I'd love to go to the beach".
Don't confuse it with the prohibition な after a dictionary form (行くな, "don't go", N4). That one is a sharp command; this one is a soft sigh, and it can follow adjectives and だ.
It's casual. In polite speech, use ですね.
Register: Casual, often said to yourself.
Examples
いいなあ。私も行きたい。
Lucky you. I want to go too.
今日は暑いなあ。
It's so hot today.
海に行きたいなあ。
I'd love to go to the beach.
きれいな景色だなあ。
What a beautiful view.
もう十二時か。時間がたつのは早いなあ。
Twelve already? Time flies.