you usually just go to the security and tell them you need to check a firearm and they tell you where to go. as far as i know hoosierpark in anderson doesn't have this option but as the way the law is worded you "should" be ok with carrying in there too.
by the way this is not legal device and i am not a lawyer. i can not be held responsible for your actions.
can't say about the boats but indiana live and hoosier park they have signs stating no weapons. Only time I leave mine is police stations and schools. so what the casino don't know wont hurt them. Also they don't check so if you are concealed you should be good.
Four Winds is a no no, in the casino. It is ok in the parking lot, there law specifically says the parking lot is not part of the casino. I have strapped on in front of the valet before.
On any casino classified as a riverboat, carry is a legal no-no. This includes French Lick. However, Hoosier Park and Indiana Live are not classified as riverboats and the signs there are "rules" and "policies" and not laws. You can legally carry there, but they can ask you to leave until disarmed. I have visited the horse races at Indiana Live but not the casino proper, so I can't say how they'd react or what type or mood of security they have in the casino.
I, however, would not leave my sidearm in my car in the parking lot of a casino unless it was very very secure. Conceal at your own risk.
I've carried at Horseshoe in Harrison co. Just not on the casino boat itself, and they, and French lick as well, provide lock boxes to secure your weapon.