Is there 24 hour check cashing on site?

Yes there is

Park in garage, valet late at night takes a while.

Yup some week nights it closes from 330 to 830am. So not quite 24/7. But grand Z. Is always.

The Grand Z will cash your check from your checking account 24hrs a day. The Z casino closes at 3 am so its not 24hrs. In blackhawk and central city if you have money in your bank account they will always get you some money. Some for a fee. Remember the Z chains cash a check from your checking account at no charge. Please remember this and tip the staff that helps you. Good karma goes a long way!