I went there on a Saturday with a group of friends. This is an ok place, but the incompetence of security, bad drinks, and the lack of seating and shade make it a not so desirable pool party...
First, the place is located at the Mandalay Bay. Parking will be easy but paid and expect to walk a pretty long time to actually get to Daylight from the parking lot since you will need to reach the outside area.
Once you get there, the line is actually rather short, but be ready to spend a lot of money. The cover and the drinks there are very expensive and watered down with very cheap brands of alcohol. The pool itself gets pretty packed without it becoming overly ridiculous. One of the main problems is security. They are extremely annoying and will make sure to check everything that's in your bag and make you throw out half of it including bottles of sun screen.
Another problem with this place is that there is pretty much no shade at all except for the main bar area so be sure to bring sun screen which is annoying since they don't even allow sun screen...
Overall, my experience with Daylight was rather bad and I would not recommend it. Feel free to message me for any additional details that you may need!