Are both OK:
First time to/at Singapore's bar street. It was a lot of fun!
This is casual speech. 'to ' suggests you are thinking that it is the first time you went there. 'at' suggests you are thinking of the street as a location, but in this case I'd say 'First time in Singapore's bar street'.
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This is casual speech.
'to' suggests you are thinking that it is the first time you went there.
'at' suggests you are thinking of the street as a location, but in this case I'd say 'First time in Singapore's bar street'.