Apparently they are open for walking, swimming, jogging, etc., but no group activities and social distancing must be practiced.
What is allowed:
Walking and running
Biking
Fishing
Dog walking, which is allowed during all hours the beaches are open
Swimming
Surfing
Participating in recreational activities consistent with social guidelines
What is prohibited:
Sunbathing
Towels and blankets
Chairs
Coolers
Grills
Loitering on the beach without moving
Congregating in groups larger than 10 people