What kind of shoes I use for a golf tournament?

I'm not playing. The PGA Championship is played in my town next week and I know that pants linen shorts and a polo will be fine, wise (to be in the 90s, high, low 100s), but what kind of shoes should I wear? Athletic tennis shoes as K-Swiss or what? Thanks! Yes I more than likely to walk all the time. I did not think it did not matter, but I was wondering. Thanks for the quick responses.

it seems that you are not caddy or anything, so it shouldn't matter. but since you are walking in the tournament and remains a very long walk, I would golf shoes. =]

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