Samuel asked: Can I ride my class 3 ebike off road, like in the grass far from traffic, or out in nature?
The statute allows electric bicycles anywhere that bicycles are allowed.
s. 316.20655 – Electric Bicycle Regulations
An operator may ride an electric bicycle where bicycles are allowed, including, but not limited to, streets, highways, roadways, shoulders, bicycle lanes, and bicycle or multiuse paths.
The exception would be any local ordinance that further restricts operation. You would need to check the authority that has jurisdiction over the property to see if any regulations are in place.