At tall, this chocolate fountain by Jean-Philippe Maury is the world& largest, located inside the Bellagio, Las Vegas. Not just eye candy, this fully-functional chocolate fountain circulates a whopping at the rate of 120 quarts per minute.
What not to do in Los Angeles (and what to do instead), I've done almost all of these don'ts and the other options they recommend. A great guide to LA for the touristy stuff and capturing the essence of LA.
Niagara Falls is a sight to see, but located south of Seneca Lake in the Finger Lakes region lies a lesser-known fantasy-like area called Rainbow Bridge and Falls in Watkins Glen State Park, New York. Maybe on Montreal trip?