Where can you park to visit the American Coney Island that is safe?

On the street nearby.

It's very safe. A lot of cops eat there. If you cruise around the block a few times and your parallel parking skills are keen you will find a spot on the street. Most spots close by are a 15 minute limit.

I actually parked on the street across from American Coney Island

On the street close to the restaurant

Street level parking, $1 per hour.