We were at Flamingo 2 weeks ago. Pool opens @ 9am, got there @ 9:10 and got 2 of the last seats available. And they don't let you just throw a towel down and go to breakfast/room/etc. Security walks around and any chairs with towels only are picked up and made avaialable. Two couples were next to us and they took turns going to breakfast to save the seats. All day long streams of people were walking around looking for seats and taking up any small piece of real estate........knee walls, ground, etc. Best though was a group of young guys. In Flamingo pool there are tiny "islands" that have a palm tree growing out of the concrete base, whcih actually has a seat ringing it in the water. Patti and I were stting there in the water and 6 guys come out and ask if they could share. They broght their towels, and each had his own beer bucket, and that was their place for the day.
I think pretty much the same can be said for Caesars at opening time, as last year I saw a line at the pool entrance when I went for coffee at 8:30am. Last year at least, you COULD just throw a towel on a chair and come back later and still have it. Don't know if they're now doing it like Flamingo security.