http://slslasvegas.com/dining/cleo

Mediterranean/Moroccan in the SLS hotel and I am totally hooked. The last time I had genuine Moroccan I was in Jerusalem, and while it's not EXACTLY like the natives make it (owing more to adjustments for American tastes than to any deficiency on the chef's part), it is still absolutely exquisite. The octopus is the best I've ever had, and the lamb tagine was just beautiful. Make sure you try the sticky toffee cake and the frozen Greek yogurt desserts (if they're still on the menu) - they are must-haves, light and not at all over-sweet. 

http://www.fourseasons.com/lasvegas/dining/restaurants/veranda/

Literally my favorite restaurant in Vegas. No matter how short of a trip I'm taking through the city, I always try to make at least one visit here (sometimes multiple visits!). If you're there on a weekend, make sure you drop by for their weekend brunch - definitely worth a visit. Make sure you call ahead for a reservation. Lunches are usually okay for walk-ins, but brunches and dinners definitely see a lot more traffic.

http://www.evvia.net/home/

They are almost always full during peak lunch/dinner hours. Several strategies for getting in (because it's totally worth it):

• Don't depend on OpenTable - only 1/3 or less of their seating is listed there. Call them directly if everything is listed as full and their host/hostess are often excellent at trying to work something out.
• They have some (minimal) bar seating available on a first-come, first-serve basis. If you're a party of one or two, this is also an excellent choice.
• Go during off-peak hours (but double-check that you're still within their listed lunch and dinner hours - the kitchen closes in between). It's actually easy to be seated outside of peak eating times.
• Call several days in advance for a reservation. A week or so is usually good enough, unless you're looking for holiday or weekend seating.

www.cafe-21.com

Their brunches and dinners are equally great. Reservations recommended though they have enough space that sometimes turnover will be quick enough for you to walk-in even with large parties. Be adventurous in your ordering. I am very sad that I lost the picture of their omelette special with its squash blossoms and humongous cast-iron skillet flower-like presentation. That one is worth getting every single time.