Depends on the type of sand.
Hard packed & slightly damp?
Soft sinking dry sand?
Any car can drive on the beach if the sand is firm enough.
If its soft at all the Legacy won't be going very far no matter how low you air down the tires.
For soft sand you need tires with sidewall & 10-15 psi pressure.
Low profile tires are destined to fail in the sand, entertaining to watch though.
New 2011 VW Touareg FAIL - YouTube
Hard packed & slightly damp?
Soft sinking dry sand?
Any car can drive on the beach if the sand is firm enough.
If its soft at all the Legacy won't be going very far no matter how low you air down the tires.
For soft sand you need tires with sidewall & 10-15 psi pressure.
Low profile tires are destined to fail in the sand, entertaining to watch though.
New 2011 VW Touareg FAIL - YouTube