It's so nice to find authentic little places like this one so close from the Strip. Well and it's also nice for us, people of Las Vegas, not to have to go on the Strip too anyway, lol ! It's on Polaris and Spring Mountain, close the I-15 entrance, behind the Mirage.
Not far away from the bling bling bars of the Las Vegas Boulevard with no drinks under $20.00, here is the Sand Dollar Lounge.
All the cocktails you can imagine, craft beers, pool table are available 7 days from 7:00pm (I think 8:00 on Sunday) to 3:00am. They have live music most of the evening with different groups. Really like the LouLou White band.
If you get hungry or simply need food with your drinks there is a food truck outside serving homemade Mexican food.
That place is not very crowded if you go too early but gets busy with a good and friendly ambiance as the night goes by.