Between 1855 and 1877 O'Brien purchased his father-in-law 's share of the land , renamed the land the `` O'Brien Estate , '' and made the beach and the surrounding land available to the public as a picnic ground and amusement resort .
In between 1855-1877 O'Brien bought his father-in-laws share of the land and named it the `` O'Brien Estate '' . He made the beach and surrounding land available to the public as a picnic ground and amusement resort .