I was just having a bit of fun, giggling as I took this picture of my poor brother lined up beneath Fremont's Pyramid. But it was good clean fun.
But in general the rule of thumb is that a photographer should not place the foreground subject against a background in such a way that there are odd appendages on the subjects body.
Favorite thing: You'll need a water-proof camera. You can even have fun with it. Here I am taking a picture up through the waves.