Mother-of-two Tracy Kearns, 43, of Kinmel Bay, has not been seen since about 20:00 BST on 7 May.
On Thursday, a 48-year-old man, who police said was known to Ms Kearns, was arrested on suspicion of murder in connection with her disappearance.
Police said specialist searches were focused on land alongside Tir Prince leisure park and extensive searches were ongoing in Kinmel Bay and Towyn.
Ms Kearns is described as 5ft 3ins (1.6m) tall with sandy coloured shoulder-length hair.
Supt Sian Beck, from North Wales Police, said: "We are still trying to find Tracy.
"Officers are carrying out house to house inquiries, speaking to local people who may have information."

Stephen Archer, 51, of Victoria Street, Openshaw, Manchester, was convicted on Thursday at Manchester Crown Court of murdering his sister Julie, 49.
Ms Archer suffered 95% burns in the attack at her home on Surbiton Road, Newton Heath, in February 2016, the court was told.
Archer was told he must serve a minimum of 27 years.
The jury heard Archer had falsely accused her of murdering their father and uncle and doctoring a will to disinherit him.
The court heard Julie was left with "horror movie" injuries after Archer doused her with flammable liquid and set light to the vapours as she sat on a sofa.
Ms Archer's 19-year-old daughter, Quibilah Archer-Cunningham, escaped with minor injuries after jumping from an upstairs window of the house. The family dog died in the blaze.
Archer was cleared of arson with intent to endanger the life of his niece.

The woman was attacked by a man at St Denys station in Southampton just after 00:00 BST.
Hampshire Constabulary said her attacker fled the scene in a vehicle and have appealed for witnesses.
The arrested 18-year-old is being held on suspicion of rape and attempted murder and remains in custody.
Specialist teams have joined the search for a woman missing in Conwy county.
[NEXT_CONCEPT]
A man who set his sister on fire using a "petrol cocktail" has been jailed for life.
[NEXT_CONCEPT]
A man has been arrested over the "violent assault" and rape of a woman in a railway station car park, police have said.