I Am Going To Vegas In May…should I Reserve A Hotel Now Or Wait Until Arrival?

We are going for our 5th anniversary. When we were there before we reserved a basic room and got an upgrade upon arrival for really cheap. So I am wondering if it is best to have a reservation in advance or if it is better just to arrive and see what kind of last minute deal you can get. We are staying Tuesday thru Friday check out on Saturday (May 1 for 4 nights). I want to stay at New York New York or one of the hotels in that area. I was just wondering if anyone had any experience being a walk-in in Vegas. Thanks for any insite.

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