I went to the outside gondola place around 5pm on a Sunday with my girlfriend, who was all hot on this attraction. There was no line. My cheap ass didn't want to pay for a private gondola, but I didn't want to be staring at some random couple. I fortunately timed it right, it wasn't busy, and they put the two of us in our own private gondola. The gondolier was excellent, had to be the best singer of the whole bunch. My girlfriend was in heaven with all of the LV strip gawkers watching us. I tipped the gondolier a $20. Very expensive for what it really is, but worth it to do it once.