One of the reasons we stayed at the Grand was for the pool deck. It has to be one of the best pools in downtown Vegas. Please note that cabana minimums changed based on day of the week, etc. It is worthwhile to get a cabana because you get a place to hang that is comfy.
They serve food on the deck along with drinks. Service was a little slow so that dropped the stars to four vs. five. We were able to meet some folks from WI and IL so it was fun to meet some other folks.
They have refreshing water out there as well because it gets really hot on the deck. The pool is your savior so dip in and then get out back into the sun. If you are staying at the hotel you don't need to bring your towels. Also, they have DJ's spinning and live music at night so this place is jumping!
Also, there are coupons for the deck if you are staying there. For us, we had such a nice stay that next time we will only stay at the Grand. Their comps programs are awesome and they have great service.