Gotta add this which may have already been mentioned someplace above ....
Figure a $20 to $50 entry fee for the pool parties and night clubs. But always ask for a complimentary pass to either of the above or both if while checking into your room. (A tip usually helps if comp passes are available.)
And there are a good number of Comp Passes Hawkers on the Strip that hand out club and pool passes and a small tip is expected. Some passes require that you arrive early so that when the paid customers walk in ... the club does not appear empty nor deserted.
And if you are a big spender ,,,, it's wise to reserve a table and have bottle service. But expect to pay $700+ per bottle which just might be cheaper than purchasing individual cocktails.
I don't know how it's done at present but a short while back ... customers had to pay $2,000 to $4,000 up front for VIP service and a good table and a tab was maintained just in case your party consumed more than $2,000 - $4,000 worth of alcohol.
Don't ask for table service if you only intend to have a couple of beers and spend the time dancing your ass off on the dance floor.
Movie production members of my family are also professional dancers and acrobats so the dance floor is usually cleared after they have a couple of drinks and take over while everyone stands around and gets bewildered. Once they returned to the table, the house usually picks up the tab. *They are that good!