Especially at Low tide and after dark. they are everywhere. Do not Rev your engine if you get stuck.. You can try to pull out your boat but if you are too far in you will have to wait until high tide.
Be very careful driving, especially at night. The main road leading through the Keys is a two lane road which is not lit at night. People walk across the road at all times and are virtually impossible to see. Also, numerous fatal accidents are caused every year by drunk driving.
If you're planning a visit to the Keys, try to stay overnight if at all possible. You don't want to be driving on this road at night, especially on a weekend.
The pina coladas and fancy nuts at Pierre's are not exactly diet fare but who cares, you're on holiday, right? ;=>