I heard about Lotus of Siam years ago from a friend but being stuck on the strip each and every time I visited Vegas I never had the chance to venture out. Until this time.
Lotus of Siam is located in a strip mall away from all the action of the strip. When you step in the door you are greeted by a narrow waiting area filled with newspaper write-ups over the years giving kudos to Lotus. If you are a drinker your best bet is to wait for your table in the bar area as there will be a wait--weekends can run up to an hour or more. The bar is beer and wine only.
There are tons of tables inside Lotus of Siam with bright hanging pendant light fixtures. If you are looking for a dark atmosphere you won't find it here.
Lotus of Siam has really great tasting Thai food plus an excellent selection of wine. I had the drunken noodle crab. It was good but a bit steep in cost at $19. My friend had a beef dish that cost $18 that she felt was overpriced. I feel like your best bet is to order from their basic Thai side of the expansive menu as those dishes are $10 or less and will be same portion size and just as tasty.
Tip for the restaurant: the food is served in shallow dishes which means that it gets cold quickly. Serving it in deeper plates would be a great improvement.