Ocean City Maryland Vacation Rental

[Bill Ames]

I'm looking for a vacation rental property in Ocean City Maryland that my family and I can use a couple times a year and rent out the rest.
I currently have "regular" rental properties and for the most part understand in my area at least how much say a 200-250k house can rent for each month with a year lease but have no idea where to start in trying to determine the potential rents of a vacation property.

How do you determine how much rent per week/month/year you can realistically bring in? Is it best to reach out to a vacation rental company to get this information or will they exaggerate? 

I would appreciate any direction you have to offer.