You guessed it!! In the bathroom. I actually don't snore, but I have a friend who fell asleep in the stall at work and was sawing logs. Luckily someone simply knocked politely on the door and woke him up. If you do snore napping in the bathroom probably won't work for you.
You are probably laughing about now but think about it. You have privacy. Who is going to open the stall door? They might knock on it but they surely won't open it. I wouldn't suggest using the bathroom closest to your work area as people who see you regularly might recognize your shoes. Again you laugh, but it did happen to a friend of a friend.