KAILUA, Hawaii -- A rash of burglaries have hit Kailua vacation rentals, many of which are operating illegally, KITV 4 News reported.

Police believe many beach visitors are provided a false sense of security while settling into a vacation rental.

"They're perfect for the criminal," said Honolulu Police Department Detective John McCarthy. "They're here on vacation; they let their guard down. They have valuables. What more can a crook ask for?"

In the past two months, McCarthy said 14 rentals have been burglarized.

"Primarily along the beach stretch Lanikai out to the Mokapu area, suspects are entering the homes through unlocked doors (and) taking whatever is available," McCarthy said.

Wallets, digital cameras and backpacks have all been stolen from the homes.

Police told KITV 4 News that the robber or robbers are familiar with the area and might be entering the homes from the beach side.

Police say vacation rentals, especially those without a resident on the property, are prime targets.

"Homeowners, the people that are renting this stuff out, should make sure that it's safe, especially if they are renting it to people who are from out of town," McCarthy said. "It leaves a bad taste in their mouths, and the victims have expressed that to us."

The break-ins have happened during the daytime and at night.

Police encourage anyone to report suspicious activity.