In addition to food that is upscale and delicious, Mastro's Ocean Club inside Crystals complex at CityCenter, has two major attractions: a piano lounge that serves stellar martinis and the "Tree House," a two-story wooden sculpture that rises from the ground level and houses the main dining room 30 feet above the ground. Menu items range from vanilla-battered shrimp and ahi tuna tartare to New York strip steak and rack of lamb. Side dishes tend to be predictable, except
for the Gorgonzola macaroni and cheese, and lobster mashed potatoes. The signature Warm Butter Cake alone warrants repeat visits.