"Siren, sing your song, because it's your song when you're on vacation!"
It's a playful, encouraging statement, possibly directed towards someone who's on vacation and is expected to sing or perform.
Here's a more natural-sounding Tagalog translation:
"Siren, kumanta ka ng kanta mo! Kasi iyan ang kanta mo kapag nagbabakasyon ka!"
This translation preserves the tone and meaning of the original Pangasinan phrase.