I flew there in 2005. Don't know how it evolved since then.
Access
Entrance via the south-eastern corner of the un-built area on which the take-off lays, via 'Camino Algarrobo Mirasol' (or maybe alternatively via 'Almirante Lynch' (north-western corner of the field)) (115km from Santiago, about 2h10 drive).
Rules
Please respect the neighbours quietness and privacy: don't watch them laying down on their private deck or by their pool!
WEATHER
Be careful flying too much north of the beach if the wind drops: landing in the water can easily kill you!