Florida Keys Short term Vacation Rentals

[Cam Bare]

Looking at buying some property for short term vacation rental in the keys. From what I understand the upper keys such as Key Largo and Islamorada will not allow short-term weekly vacation rentals. However Marathon key where I have been looking will. That being said my questions are.
Is there a way to get around the short term weekly rentals in Key Largo?

Also I was told by a real estate agent that the short term rental market in the keys is only good from January - April and June - July. Does this seem accurate???

Thanks for the help!