Even if you're Marriott Platinum you won't get free access to the Cloud Club unless you're lucky. I 'think' (been a couple of years ago since I stayed there) that the daily fee is $50. Room key is coded for entry. Cloud Club is a very nice exec lounge, with higher levels of booze & food. Chef there at bkfst & dinner - ie, it's not your normal crappy h'ors douerves. Given resort prices the $50 could be well spent in terms of ROI on food/booze. Not sure what the Sky Lounge is - I thought they only had the Cloud Club.
Cheers.
PS - I really like this property.
PSS - If you do a search (button in upper right corner), there have been some other threads re; this property, so you can get familiar with it.