I went to Parasol Down on a Tuesday night for cocktails with a few friends and I have to say that it is a pricey but nice spot.
This place is located inside the Wynn casino/hotel by a little artificial lake which makes it a pretty unique place in Las Vegas. Parking will be free at the Wynn parking lot. This lounge is actually rather small so it might be hard to find a free table on a busy night. There were one or two tables left when I went there on a Tuesday night.
The greatest thing about this place is definitely the atmosphere and the scenery coupled with the lake shows every 30 minutes. The shows are pretty nice and will make a nice addition to your evening.
Sadly the cocktails are pretty expensive and you should expect to pay between $16 and $22 to get anything. Even a coffee will be about $6.50.
In conclusion, I would say that this is a pretty great place but be ready to pay above average prices for your drinks. Feel free to message me for any additional details that you may need!