Resorts Hotel and Casino is the one with the parking lot across the street, and about 1/2 block up when driving or walking toward the ocean and boardwalk.
If you show a Resorts Casino player's card to the attendant in the booth as you drive in, the fee will be $5.00 instead of $10.. You can obtain a free card at the Promotions Booth. You need a picture ID to obtain the card, but you do not have to show any ID when you enter the garage. So someone could obtain a card before you come and give it to you to use.
Once in the garage, there is no time limit on how long you can stay--one hour, one day, one week, whatever. When you do drive out, ask for a receipt. If you then go to the parking garage of another casino before 5:59 a.m. after the receipt time, you will not have to pay any fee. The receipt from any casino allows you free parking at one other casino that day, or I think you could even use ot to return to Resorts the same day. (You could do this in the past but they might have changed the rule about using it at the same casino that issued it).
Have fun!