When should you take your car to the dealership?

I’ve noticed the tread on my fairly new Honda Fit’s tires seems to be wearing unevenly. If I take it to a Honda dealership or service center, is wheel alignment covered under the Honda warranty?

The clear coat on my bumper has started peeling. It looks awful! How can I fix a peeling clear coat on a plastic bumper?

The sun visor in my car keeps falling down whenever I put it up. It doesn’t seem like a big issue, so I’d rather not bring it to a mechanic. But I don’t know what to do! What’s the best way to fix the sun visor in my Toyota Camry?