The best day to come to Venetian is during weekdays...less crowded and you get to spend more time walking without bumping anyone as you walk.
I love the Phantom of the Opera and been here 2x within the span of 5 yrs. We like window shopping at the Canal.
But overall, it does get tiring after sometime...if you've been here more than 5x in your lifetime, you will yearn for a different things to do/see.