Is Metal Detecting allowed: No, I found no reference to metal detecting in the state park regulations. I would suggest contacting a Park Manager.
You can view the state regulations HERE
I only found the following:
Unlawful acts in State Parks and State Forests include (but are not limited to) the following:
• Destroying, cutting, breaking, removing, defacing, mutilating, injuring, taking or gathering any tree, shrub, other plant or plant part, rock, mineral, or geological feature except by permit issued by the Division.
FMDAC Disclaimer: FMDAC assumes no responsibility for any person who knowingly or accidentally violates any state park regulation. Although FMDAC will try to keep this information current we cannot anticipate how each regulation will be interpreted by a specific park department, park employee or other government employee. It is the sole responsibility of each individual to know and obey the regulations of the park or area they are visiting and or metal detecting.