Originally Posted by Jesus H Christ

Actually, the signs are adequate to invoke the trespass law.

810.09 Trespass on property other than structure or conveyance.?
(1)(a)A person who, without being authorized, licensed, or invited, willfully enters upon or remains in any property other than a structure or conveyance:
1.As to which notice against entering or remaining is given, either by actual communication to the offender or by posting, fencing, or cultivation as described in s. 810.011; or
2.If the property is the unenclosed curtilage of a dwelling and the offender enters or remains with the intent to commit an offense thereon, other than the offense of trespass,
commits the offense of trespass on property other than a structure or conveyance.