1st stop of your Vegas visit - even before the pool - should be Walgreens.
Extensive selection of alcohol - from liquor to beer to wine. I was so excited to see Bloody Beer in cans and Lime-A-Rita cans. I've never seen this before. When you think about it - $30-ish for a bottle is basically 1.5 drinks at any club after tip and tax.
Pick up some pre-made food and snacks too.
Some employees are helpful, some cashiers are sloooooooooowwwwww.