Griffith Observatory
Address: 2800 East Observatory Road Los Angeles CA, 90027
Website: Click here
Days open: Sunday, Tuesday - Saturday
Hours: Tuesday-Friday Noon - 10 pm, Weekends 10 am - 10 pm
Features: Parks and Recreation, Space and stars
Cost: Adults: $7.00, Children: $3.00, Parking, etc.: Free
Recently renovated, it has a good planetarium show (note that children under 5 are free, but only allowed at the first show of the day).