I only go to the beach to stare at girls' feet.
Is staring at feet your favorite thing to do?
Yes, for me nothing can compare to female feet.
Leering at women at the beach isn't appropriate behavior as it's both creepy and demeaning towards women. While it is okay to have a fetish regarding feet, you shouldn't involve unwitting participants in your fetish.
What's wrong with it? Nobody saw me.
Going all the way to the beach just to stare at women's feet is a bit creepy and it indicates that this fetish is taking over too much of your life.