Your night out is over. You step out of the club's raging din and onto the sidewalk, where the relative silence is as shocking as a slap in the face. Head spinning, you realize you might not be up for the drive home just yet. Stumble over to Puerto Sagua for a no-frills Cuban meal in an atmosphere easygoing enough to enable a soft landing when you come back to earth. The restaurant -- a South Beach institution for more than 30 years -- stays open until 2:00 a.m., perfect for clubland's early exits, and it won't break the bank, assuming you have some bank left after those double-digit cocktails.