Risky. If you come as a tourist while your work visa is pending, the border agent might think you plan to stay. You need to show a strong reason you will go back after your visit.

I don't think that is a good idea, so you do not jeopardize your chances. Yo should seek professional help though

No, you usually can't visit U.S. for vacation while waiting for work visa, because it might cause worry about if you will go back to your country.

Very bad idea