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しかもこんなオマケまで見られるんなら、ほんと、子供の頃にも遊びに来るんだった **なって**

Furthermore, if i were able to see this kinda of bonus (sunset) , honestly, i
(should have?) came here to play when i was a kid.

There is an entry for なう meaning "to do" as a suffix, but how does it convey
the meaning that i think it conveys in this sentence?

should have = んだったなって ?
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2017-07-07T23:13:33.113
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2017-07-08T19:11:13.217
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question
grammar
（来る）んだったなって = should have (come)?
> > しかもこんなオマケまで見られるんなら、ほんと、子供の頃にも遊びに来るんだった **なって**
>
> Furthermore, if i were able to see this kinda of bonus (sunset) , honestly,
> i (should have?) came here to play when i was a kid.
>
> should have = んだったなって ?

As A.Ellett says, it's だったなと[おもう].  
It's a contraction of 遊びに来るのだったなと（思う）. It's the same as 遊びに来ればよかったなと思う, so you
guessed right and it's saying "I should have come to play here when I was a
kid."

And we never really say these, but I think this の is representing もの,
'things'.  
来るんだったな（＜来るのだったな＜来るものだったな＝来るべきものだったな＝）来ればよかったな
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2017-07-08T00:20:47.813
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2017-07-08T00:28:34.577
2017-07-08T00:28:34.577
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answer