Lago is amazing! Great view of the Bellagio fountains and the food is magnificent. Here are a few must try dishes:
Caprese
Antipasto Misto (the cheese and prosciutto are best)
Beef Carpaccio
Osso Buco
Tonno (ahi tuna and orange slices / favorite dish of the night)
Dessert
I forgot the name of the dish but it is like a lemon meringue pie. This dish had all the textures. The crust on the bottom was life changing. This dessert is so good it is worth going to this restaurant just to have it at the end of your meal.