Depends on what genre, and for what mood:
Upon arriving: something soft, cool and tropical:
Getz/Gilberto or Buena Vista Social Club, Morcheeba's Big Calm, Zero Seven's Simple Things, Air's Moon Safari.
Mid-day, some energetic dancing:
Basement Jaxx's Rooty, Unkle's Psyence Fiction,
At night, when you realize you're stuck there for life:
Shining's IV - The Eerie Cold, Agalloch's Ashes Against the Grain